I am purchasing an SM7b for vocals. I will be doing a singer/songwriter set-up, just vocals and midi piano. I was looking at this setup: Focusrite Scarlett 2i2 interface SM7b A-Designs P-1 Pre I am running Reaper on Windows 7 Is this a good setup? Out of curiosity, if I only purchased the first two items and used the built-in pre in the focusrite (maybe with a cloudlifter), how much difference would there be in sound quality than using an external pre like the AD P-1? $800 worth? Enough for the casual listener to tell?