Some of Kenwood's old DDs can be surprisingly good, if the circuitry hasn't drifted out of alignment.
I can't remember too many model numbers, but if you can get a KD-600/650 (the latter with Kenwood's own arm), that's very nice. Again with a faux-marble plinth, there's the KD-500/550, although this lacks quartz lock. Some of their cheaper, but still heavily built, DDs are worth considering too, as a nice KD-600/650 will probably come in towards the top of a $200 budget. It will sound much better than your current turntable, though. The KD-5077 is another pseudo-marble deck, has lovely, retro looks, and sounds good, AFAIK.
I keep banging on about this (apologies to everyone who's tired of hearing me do so), but the better Technics linear-tracking DDs are surprisingly good, as long as they have a decent T4P cart and are sited on an effective support. The ones to go for are the SL-7, SL-10 and SL-15. This might not be an eBay buy, though, as you'll need to check for the common fault of the arm not tracking across the record properly, which is due to a slack drive belt (easily remedied if you're handy with a little DIY, but a major pain if you're not).
I have a page up with the service manual of the commonest of these decks, the SL-7, at:http://uk.geocities.com/lineartechnics/