That room is quite small, and you're not all that far away. I'd say get the M22ti's and a nice subwoofer. That'll give you super clean sound and nice depth (with the sub) If you want a tad mellower, opt for the M3ti's.

If you were in a larger room, I'd say the M50's if you like a more laid back sound, or the M60's if you like a clean, detailed sound. But sitting that close, I honestly think it'd be a waste of your money to get towers.