I'd definitely contact SVS to get their opinion before you choose another model. They've never steered me wrong.
Can you describe what you'd want for more "wow"? For example, is it lower frequencies, higher output level, better control? If it's lower frequencies, you may want to consider one of their 16-46 subs. The response of the 16-46 PCi is very flat at $649, but the 16-46 PC-Plus at $949 (the next one up from yours) should have more output and has more tuning choices. The PC-Ultra should have better control than the others along with a higher output level. My PC-Ultra definitely wows me in a room that is about 15' x 20' with 10' cielings and a very open floorplan, but that's quite a bit pricier.