Not sure what you mean by TV base thing. Can you link or show an example? And given the height of whatever base you have in mind, would that raise the television to an uncomfortable height? Your stand is already pretty tall.
Also, if you're not going to run a subwoofer, you probably ought to look for mains that have a little deeper extension. The
ELAC B5 will be comparable to the WaveCrests, but offer extension down to 46Hz; the
ELAC B6, down to 44Hz with a little better sensitivity.
Full specs.
You don't have to rule out a subwoofer, though. If you get a sensible front-firing sub and add carpet spikes or an Auralex Subdude to de-couple it from the floor, it probably wouldn't bother your downstairs neighbors.
If you can stretch your budget a bit, this
Outlaw Audio OSB-1 would probably give you the best sound quality within your placement constraints and without using a subwoofer. Assuming you were budgeting $550 - $600 for AVR + speakers + speaker wire + shipping, the Outlaw wouldn't be too far beyond what you would've paid anyway. It looks identical to this
Atlantic Technology soundbar -- so maybe the customer reviews will help. There's also
this AH preview, which doesn't really say much.