Sounds like a good choice... if you're sitting right against the back wall then bookshelves would have a tough time really filling the room -- but 20x15 is a great size for M60s.

Running with just M60s is going to be a lot more neighbor-friendly than adding a big sub


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8