1) yes, absolutely, 110% do it!....I just could not go back to printing in bathrooms or converted rooms.
2) what do you want to do? Azo, Pt/pd, other alt processes?....An UV pt/pd printing unit takes less space than an enlarger, so you can have both. In another side I would hang the 300 W bulb for your azo prints. A vacuum frame is ideal for contact prints, unless you are doing developing out processes, then it becomes a pain in the arse....With my Zone VI enlarger I have the option of putting an 8x10 head on it, so who knows I might do that, if you have this option look for higher ceilings. A viewing light table big enough to hold the 8x20 negs you want should be good too....
As far as being a big computer room with a sink, well that is up to you.....I know I will first learn to make plates than go the digital route.