If the preamp is noisy, you pretty much have to sing louder, in my experience - if you turn down the preamp and sing normally, the noise is still there, and still bears the same signal to noise (S/N) ratio to the singing (which is also quieter because you turned down the preamp) - even though you can't hear the noise on the freshly recorded track, when you're mixing later and you bring up the gain on the track (or apply compression with make-up gain), up comes the noise along with the signal, pretty much like you had the preamp turned up in the first place. But if you sing louder, you improve the S/N ratio.
So, assuming that you're recording into a computer where you can digitally increase gain later, it's less important that you have a preamp with a lot of gain, and more important that you have a preamp with low noise. These are just observations, but it's been pretty consistent for me.
I use a SM7B with modified pres on a MOTU Traveler - but before the modification (by Black Lion) they were too noisy. The Traveler + the mods exceeded $1k, though.
I've used one with an ART Digital MPA (same as MPA Gold), but if the tubes had any hiss, then it didn't work. Even with quiet tubes, I couldn't apply very much make up gain in a software compressor.
I've used them with a DMP3 and it's predecessor DMP2 - those seem quiet enough for me.
Everyone seems to agree that that Rane MS1-B is good, but I've never tried one.
They're not for sale new, but if you can find a used TNC ACMP 73 (or 84 or even 81) that *is quiet* - some are not - you have to be sure before buying, but the seller will know, then that works, and those don't cost too much on the used market.
If your budget is higher, you have a lot more options, of course.
