If the Chinese D/S can be purchased cheap ($800 or less) and runs good it might not be a bad deal. I purchased my Tank 200 in 2005 for $500 and it is still running good today. The plastic doesn't hold up well and both mirrors have broke (taped together now) but it still runs and handles the trails just fine.

I recently picked up 2 lifan CT-70 clone 110's for my kids and they are awesome. They run great, will climb anything and are street legal. I paid $650 each and they both had aprox 65miles on the odometer. Deals can still be found, just keep an eye out on Craigslist.