I'm pretty sure I'm going to get a polk 350; but I wanted to hear from anyone who looked at these. Yes, I would like to audition svs/hsu/velodyne hgs but I want to spend
Sounds like conflicting priorities here. How much longer before you upgrade the mains? The brands you mention would be a fair step up from what you have now. Do you really want to buy a lower end sub now, knowing that you'll want to replace it in short order?
I own a Polk PSW350 (until my SVS arrives at least)... and I say go with the Velodyne. The Polk has a nice rumble to it for movies, but as Robert said, you'll get more punch out of the Velodyne.
I own the Polk and really really like it. I owned a Velo previous but it was a meager 8" and was pretty sad overall. The Polk is a big step up but really just a stop gap until I get into my new house and am able to pull the trigger and get me a big dog woofer. The Polk takes my vote, but I have never tested the Velo 10". I would go without and save the money to get something a little heavier hitting if I could do it over again.