Originally Posted by VWtech
I have 10.5" of height available
Well, then, you do have some options. Check out RSL CG3/23 for your L/C/R. Despite their diminutive size, they can get pretty loud, without distortion. Sealed design has benefits in close quarters, like a shelving unit. Ridiculous cost to quality ratio.
PSB Imagine Mini is another option. Clean, neutral, very high quality. Mini C center channel available. Also, the Alpha P3 ... with c3 center.
Wharfedale Diamond 210. A bit warmer sound than the above ... 220C center channel available.
KLH Ames with their center channel speaker. New entry, probably bright as they are Klipsch ex-patriots.
Monitor Audio Bronze 1, Bronze Center ...
Dali Zenzor Pico and Vokal Center (not the Pico center)...
As you can see there are a lot of options without the compromises associated with three center channel speakers. Do some research and choose whichever option suits you best! Also note that the rear-ported versions will need a couple of inches of space behind them.