I have to say that as a builder of a bunch of systems, and a long time studio guy, I have to conditionally disagree with some things that have been said here.
iMac - yes, you probably need to go to something more expandable and powerful. However, guys I know that work for SONY studios just recently bought G4s with the Digi002 interfaces. They love they way it sounds and functions, but APPLE quality has dropped off. It took an average of 4 returns of the G4s to finally get ones that were stable.
The same was true for early 002 interfaces. So regarding the Tascam, this would be my concern of this as well, not good to buy any of these things while they are brand new. Otherwise, people have good things to say about the Tascam interfaces.
MOTU 828mkII - Actually, this is a very decent interface and the included AudioDesk workstation software for Macintosh, with 24-bit recording/editing and 32-bit mixing/processing/mastering is decent to get started with.
However, the real answer to the question of which interface and program is the "best" is based upon you knowing how you want to work.
The problem people do not ever address when someone is starting out doing this stuff is 1) they usually are very concerned about buying the proper thing that will be hassle free, 2) they really don't know what that will be until they buy "something" and get started and 3) the idea is to be making music, not becoming a PC tech and 4) almost all the advertizing misleads people.
There are plenty of decent options out there for hardware to buy. If you want to stay MAC, then go to your MAC outlet and talk to them about what they can provide before you embark upon assymbling components. Talk to the guys at
http://www.sweetwater.com They are a huge MAC Motu software outlet. They also sell most all the opther stuff. No, they are not the cheapest, but I would think you want this to be hassle free.
The point is, do some real hands on talking with people putting these systems together and ask them why they are telling you what they are?
The following is off of the MOTU site regarding FW drives.
Assuming a FW drive has acceptable multimedia spec, there's no reason why you couldn't use it as a record and playback destination for digital audio. 7200 RPMS is the spec to look for in Firewire drives. [="http://www.zzounds.com/item--GLYNDFW80"]Glyph[/] makes high end audio drives, and we've also tested VST smart disk HDs. The 896 provides a passthru for daisy chaining a firewire HD. If you have an 828 you can daisy chain it to the HD (if the HD has a passthu)... or you can use a powered firewire hub. NOTE: G4s with firewire 800 have problems using FW audio interfaces and FW hard drives at the same time. To run both on these machines you'd need to add a PCI firewire card wtih a TI or Luncet chip and run the MOTU audio interfaces off of that card and the hard drives off of the internal firewire ports (or vice versa).
So as you can see, there are issues to comtend with, and this is true about almost all the stuff out there.
This not to say RME, ECHO, M-Audio, Apogee, Aardvark, Lucid, etc is bad stuff. But honestly, I have used lots of MOTU stuff over the years and you can make excellent recordings using the MOTU stuff. MOTUs biggest advantage is they do enough market rearch to offer a wide variety of I/O in one box, which is what the 828 is all about. So if you "need" the various I/O on the 828, you will be hard pressed to do better. So the first place to start is to ask yourself, just how many tracks you want to record at a time, do you need MIDI, and all the 20 some I/O this thing offers?
Now, one major advantage to RME stuff is that alot of the processing takes place on their boards so latency issues are greatly reduced over MOTU stuff. Also, MOTU is notorious for bad service. But what they have few compete with for features.
IF you get serious, then you will develope desires and at that point, I would suggest you worry about something better.
After all, you have stated a SM57 or 58, which are essentually the same capsule in the mic. One differs from the other only by the presence of the windscreen, which in effect keeps the singer from getting as close as they can to the capsule of the 57.
I would advise that $300-$500 could be better spent towards a better mic or mics than can be gained by a marginally better sounding preamp. Again, you also need to address monitor speakers, which will inevitably take you towards addressing the room acoustics. Again. money better spent.
Personally, I'd steer you towards the [
="http://www.zzounds.com/item--DGDMX002"]DigiDesign Digi002 interface and software[/
] if you are moving towards a HUI type system. Its easy, industry standard and offers most everything you say you want in one MAC friendly package.
See compatibility specs [
="http://www.digidesign.com/compato/osx/002/"]here[/
].
Oh, and I do know a thing or two about drums, and you really only require 4 I/O to get an exceptional drum sound. You will want to be concerned with monitoring latency. You will want 2 Large Diaprham condnsors for overhead, something like the Studio Projects B1 and a decent kick drum mic in addition to your SM57.
LDC mics are money well spent.