It's a little hard to tell what the true character of the mic is in your sample, because there's so much reverb on it, which has a tendency to subdue definition and clarity. I'm not saying you shouldn't use whatever reverb you want, or however much you want, but when you are testing mics to see which sound best, you're better off to listen to them "dry" so that you can focus in on the actual sound of the mic.
It also depends on the environment in which you are recording.
If you are in a space which is acoustically untreated and highly reflective, then a dynamic mic like the SM7 might be a better choice for you than a condenser like the Rode, because dynamic mics tend to be less sensitive to their surroundings than a condenser will.
If you do go with the SM7, you'll need a preamp capable of delivering sufficient gain, as that particular mic has a lower output - not only lower than condensers, but also lower than many of its dynamic counterparts as well.
I would suggest a preamp capable of delivering gain up to around 65-70 or so. The Grace m101 is an exceptional pre for this; very clean, transparent (
not "colored" as other pres which have transformers or tubes) and has a nice amount of available gain ( 68 db). Or, you could get a pre with lower gain and add a
Cloudlifter, which is an inline gain booster, which uses the phantom power from your preamp and converts it into additional gain for the mic by +10-20db.
(A higher gain pre will also not only give you far more headroom for condensers, but will also allow you to use ribbon mics as well, if this is something that may interest you in the future.)
If you do end up with a condenser mic like the Rode, then any decent preamp will do the job, as condensers don't require as much gain to work at their optimum - HOWEVER - you should
still get as
good a preamp as possible, the best you can afford, because it will affect the sound of the mics you use - in either good or bad ways, depending on the pre.
A good preamp is also something you'll never not use. It will
always prove itself to be useful, in any situation using a mic, regardless of the type of music you will record now or into the future. Good preamps also tend to allow mics to sound as they should.
Now...if you go with a standalone hi-end preamp like Grace, or Millennia, or Great River, you'll need to make sure that your conversion system is of high quality as well, as most of these mic preamps don't have computer connectivity.
This starts to add up in money, but as most anything else, you'll generally get the quality you pay for. A good mic, preamp and conversion system will last you a lifetime. Remember that your signal input setup is like a chain...the quality will only sound as good as the weakest link in that chain will allow it to sound.
I know you're trying to save money... who doesn't? We all like to get the best gear we can at the lowest possible cost. But I can tell you from personal experience that you'll end up paying
a lot more in the long run by making small improvements every so often, than you would to just bite the bullet and get something good from the start. It will also save you a lot of time futilely trying to get "okay" gear to sound like "really good gear", which you never really will.
Like most who start with inexpensive gear, you could continue to go through various lower cost mics and preamps over time, stepping up each time you buy, spending money every year or so, all in an effort to search for the sound that you truly like but haven't quite yet achieved, or... you can suffer once and then never have to worry about it again
IMHO of course.
