Thanks. I ended up findinf and purchasing the stand in the 2nd link above and its a quality piece for the price. The middle shelf is like 10" high and fits my center channel speaker perfectly!
The top shelf is rated for 300 lbs so should be fine for the 65" ST50 I'm planning for with is about 90 lbs. That TV will over hang the stand by less than one inch on either side though. My hope is that it doesn't look like it is somehow mismatched or something like that but from the sounds of it, a larger screen than the stand it rests on may look fine. I guess since the plasma has its own stand, there is some visual separation there.