Look at a used pair of Clayton Audio M 70's. There is a used one listed on this sight at well within your budget. I can vouch for the product, but not the specific one listed.
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If you could stretch a little you can pick up a demo Blue Circle BC26 for that money. Great power which the Dyns need and it is alost tube sounding in the midrange but has that ss slam in the bass. Call blue circle and they will sell you their demo unit with warranty! www.bluecirlce.com
I currently have the 4BST and I would buy the BC26 myself, alas they are out of my price range.
Best of luck