Considering that brightness is your problem, the 'table which immediately springs to mind is Sota. They recondition their trade-ins to as-new and sell them at a significant discount. In this way you get a guarantee as well, I believe. The website TNT-Audio has an excellent review with these matters explained at http://www.tnt-audio.com/sorgenti/sotastar_e.html.
The Sota is perhaps the best isolated 'table out there, and a good suspension usually means less brightness: it's hung from four springs, and if you get the plain vanilla Star Sapphire (with a sapphire bearing plate) you are getting a true high-end 'table at close to your budget (you'll have to call), finished in excellent real wood. Add the ubiquitous Rega arm to go with this, and you can keep and get the maximum out of your Eroica, which is reputedly very good. There's also a used Sota for sale on this website, with air-bearing arm (complicated, though very good), and a used Well Tempered, both very smooth, both on your budget, though I favour the WT for musicality. Maybe you could find a used VPI Mk IV, very warm in the bass, again with Rega arm. Or a Roksan/Rega, great if rhythm is your thing, as is Linn (only consider the LP12, and make sure it is recent). Look around: you're probably better off keeping the cartridge and upgrading, just as you're thinking, given your very high-resolution system. Since this website is crawling with Teres 'table fans, I'm sure they'll advise you this way. But I'm not familiar with this 'table or their variety, so I leave it to them.
Just to throw out a cheap and controversial alternative: one of the rockinest, best rhythm and best-isolated 'tables out there is for sale on this website for $255: an Acoustic research "The Ar Turntable". Try it with it's stock tonearm, but upgrade soon: this 'table is so good you can consider better even than the Rega tonearm, though this is very good. Some have mounted SME IVs and Vs on this 'table. (Just so eveyone knows, I'm a Rega arm fan). I'd buy it myself if funds allowed right now. Of course, there are more detailed 'tables out there, if you're willing to shell out a lot of dough, but none more musical...you'll have to organize the replacement for the armboard and such yourself...and check the bearing! Good Luck.
