You are right to query whether the available gain on the FireStudio is enough for the SM7B, as I think the answer is that 50dB is not enough for many sound sources. Having to run with the gain control at or very near fully up is not a recipe for low-noise recordings.
See what PreSonus says about this, although I think this particular issue is more a matter for the sales department than for technical support. You could be in for another round of interface hunting.
Regarding adjective editing, there's no-one sitting there approving every post as it comes in - it's the site that does it. You should try living in Es*** or S****horpe.