Ok, thanks, guys. I had a feeling that would be the response as I've seen the phrase "speaker level inputs" mentioned in various places. I also got a reply from Jack at SVS saying essentially the same thing.
Funny you posted the pic of the Outlaw sub, Phillip, as I've been considering upgrading my receiver to the RR2150, which has the sub output I need. I am leaning in that direction anyway as this VSX-5300 isn't going to last forever.
So, assuming I go the route of upgrading to the Outlaw receiver with sub output, am I on the right track with the two subs I mentioned or would someone recommend a different one (at about the same price point of $600 - 700)? The sub would be used in a room that measures roughly 11' x 13' and I'm going for a decent 2.1 system used primarily for music with occasional HT.