Looking to purchase my first mic preamp for my home studio. I'm planning to use an SM7B and Sterling Audio ST51 through it. I don't need multiple channels, however it may be nice later on. The SM7B from my understanding has an output level of -60dB, so I want a preamp with enough juice to make that sucker sound decent. I'm looking for recommendations for solid single channel preamps, new or used, in the $300-$600 range (if that's even possible). I could spend a little bit more if I really need to. Would prefer a rack mounted form factor, but can deal with whatever size or shape if the price is right. Can any of you seasoned guys start me out in the right direction? I know guitars and guitar amps, but know virtually nothing about preamps and mics. Thanks!