If you're not someone who works heavily with the numberpad (I mean honestly if you don't know whether you'll miss it or not, chances are you don't), you can get used to using the number row really easily and be almost equally as efficient. TKL's are nice, but if you really like full-size go for it. I don't mind either but that's my opinion.
Browns should be fine for gaming and typing, it's like the hybrid switch. They're a little bit more quiet, but if you bottom out they're still considerably loud. Just without the click. I think you'll be okay with browns, maybe get some o-rings.