Hello,
I had an Omni i/o witht the Delta66 card a while back and I found the interface pretty useful. Basicly, if you don't own a stand alone mixer, an Omni interface is a nice choice because it allows you to monitor hardware in your studio as well as easily route things in and out of your computer. For me, I decided that I didn't want to be stuck with a PCI card for portability reasons so I went USB based with the MBox. I did some basic tests on the preamps and found them to be pretty clean for their price range but "added" nothing to the incoming signal. I wasn't a huge fan for the software interface, particularly when saving settings, but it wasn't bad. 2 h.p. jacks are handy especially when you want to record someone and be able to monitor it yourself if, like in my case, the musician was playing right beside me (mic i/p) while I was recording into my pc. I think that it's a good setup in general and very respectable.
As far as an external preamp is concerned, I never used one so would be interested to hear what anyone else has used as well on that particular interface. Just for curiosity, what price range of a preamp would you be in the market for, I may be able to suggest a few if you could reply back with some requirements...
Best regards,
mIchAEl

Thanks mIchAElpEdErsEn ..

Mic for about 500 .. and pre for about the same maybe more like 700 ... I was thinking of the AT 4040 or SP c1 and the RNP/RNC budle ..