If you don't want to ceiling mount and shelf mount at the back of the room the 3100/3700 is your best option. Not from practical experience but from what I have read the 3100/3700 is significantly improved over the old 3000/3500 that had rather poor black level so I can't recommend the discontinued 3000/3500 at any savings. The 2150 could also be mounted close to the back of the room but still must be inverted under a shelf high up or ceiling mounted.
"Smart enough to know better, to old to care" ------ Dedicated Bat Cave Home Theater, JVC RS49U/Mitsubishi HC7900DW Projector, 110" 16:9 Jamestown screen with variable power masking for CIW 2.50:1 to 16:9, Marantz 7009 with 7.1.4 Atmos with Ohm mains,3 DIY Subs (2 15" (1 ported, 1 sealed and a 12" 4th order bandpass), 1 DIY butt kicker, Custom Built HTPC, 18TB DroboFS NAS
Last edited by rekbones; 02-16-2018 at 10:23 PM.