Paradigm & PSB both make some fine speakers in this range. Speaking of Ebay, there's a pair of Paradigm Monitor 9 speakers being auctioned currently (not by me, I might add), and the price is under $150 at the moment. Those are some very nice speakers, and will likely go for far less than retail. Even new, the Paradigm Monitor speakers are within your range and are excellent speakers for the price.
You might also want to check out Athena's Audition AS-F2; these are really nice speakers for the price and have received really good reviews.
Audio Advisor has a fantastic price on them right now. Best Buy also carries them (but don't let that worry you- just so happens they're decent anyway!
).
PSB's image line has a few nice floorstanders in that range. TAS has raved the Image 5T particularly, giving them an Editors Best Buy award. They give you pretty decent bass and nice sound in a pretty compact package.
Monitor Audio's new Bronze B4's are also a good choice in this price range. They have dual 6.5" woofers and will crank out good bass. I mention this model specifically because I've found the MA speakers to be a superb synergistic match for Denon electronics.
The Infinity speakers mentioned by a previous poster have gotten pretty good reviews, too. You can usually get a decent deal on them as well.
I myself am not a big fan of Klipsch speakers (can't stand the "horn sound", YMMV). But they do have high sensitivity & good bass. You can probably get something in your price range, and they'd be worth a listen, especially if you're more into rock & hip hop. They sound pretty edgey with brass & strings, IMOHO, but that isn't an issue with rock.
I've tried to list mostly models & brands you can find in a store. If you're willing to buy from internet-only companies, you might want to try some Axiom's. They have a great rep & a good money back return policy.
There's probably several others I'm forgetting, but that ought to give you a good start!
