Justa, I haven't owned any AT mics, but I've been using two Studio Project B1 mics. It's a real workhorse for a $99 mic, and I particularly like its rather flat sonic character--what I put in front of of it comes out with very little change. This quality helps me use it comfortably with everything I need (mainly stringed instruments) in my small home studio. I just play around with mic placement
until I get the sound I'm searching for. Works very well.
If you're not set on an AT, then search this forum and you'll find much too much written about the SP B1, mostly very positive. The British magazine "sound-on-sound" also ran a very pos review of this mic a couple of months ago. It's a low-cost, but effective solution for us serious home hobbyists, and I never hestitate to recommend it.
Good luck,
J.