Bass driven floorstanders?

Slim towers will get you in the 30's - 40's . Need a 12" or 15" driver if you want to go deeper. In that price range Look at Cerwin Vega .

Perhaps a speaker with built in powered 12" drivers . 

chrisr, I have something for you to consider. Personally I beleive there is no way you're going to beat (price and quality aka value wise) this. And to maplegrovemusic point, they are powered with a 200 watt amp. They are rated to go to 32Hz. I have one used and one BRAND NEW (as in unopened manufacturers carton) pair of JBL S412P speakers. I'm selling them for $400 used, $700 new, $1000 both pairs. And to djohnson54 point, he/she is correct. I have a pair of T1s. The issue there is simply a matter of price. For what I have at the price I'm selling them for they are a better value than the T3s. You can contact me off board at erp50@juno.com if interested. Thanks. Hal

thanks all for suggestions.. I have been considering the triton line; I know they have been received very well by the press, but a dealer carrying the full line and also selling mostly magnepan and b&ws, pretty much told me that they were not so impressed.  The store was busy that day so I could not sit for a demo.  I looked at the JBLs, but if I bring them home, my wife won't talk to me for a very long time....  I have tried to stay away from subs, because I read you really need two to obtain even bass throughout a room, and I am not sure they would blend well with my rega rs5 (thinking of velodyne impact 10, or rel or sunfire around $400).  My marantz integrated has no bass management capabilities, just preamp stereo output, and a second set of speaker outputs.
The thing about the regas is that midrange/trebles are the best I have ever had; they are just the last word when it comes to bass below 60/50hz.