I think we can let chadci decide what s/he wants to spend.
As for the question at hand, 50mm is too narrow for most small rooms unless you are looking for more closeup type photos. That's the reason I sold my original FA50, because it never got used for it's intended purpose. I have and use the DA35 f2.8 Limited and yes, it's on the pricey side. However, it's a nice match for your stated type of shooting and it Does give 1:1 macro as a bonus should you decide to use it. If however, you are absolutely certain you won't want to go there, another worth considering is the FA35 f2.0. They can be had in $350 range (used of course as it's out of production), is sharp wide open, and is probably fast enough to accomplish what you want to do.
If you want a fast 50, go manual with an A or M type 50 f1:1.4 or f1:1.7. 1/3 the cost (at the most) of the FA50 and a better lens investment in my opinion.