I agree with Kotta, I haven't heard the Ming-Da, but the cambridge is underwhelming in my opinion. For 250 you can't expect much, and this is better than the 250 bucks, but if you can you're much better spending a little more on a used piece of gear which you'll be happier with for a while. In terms of tube/ss there are about a thousand posts that mention this, and it's really about personal preference (the typically warm/sweet/musical sound of tube vs. the detailed/analytical/fast sound of ss--however you can find tube that does analytical and ss that does warm so these are usually just stereotypes...err..bad pun). I'd say for the price range you're looking there are probably more ss options that will have perks like remotes and phono stages, but I could be wrong.
Just a random sampling of things on agon that might fit the bil:
Audio Refinement Complete (no phono, but this is a great unit):
http://forum.audiogon.com/cgi-bin/cls.pl?intatran&1127326657
Arcam A65+ (has phono...this would be my pick!)
http://forum.audiogon.com/cgi-bin/cls.pl?intatran&1127251562
Just a random sampling of things on agon that might fit the bil:
Audio Refinement Complete (no phono, but this is a great unit):
http://forum.audiogon.com/cgi-bin/cls.pl?intatran&1127326657
Arcam A65+ (has phono...this would be my pick!)
http://forum.audiogon.com/cgi-bin/cls.pl?intatran&1127251562