Dell's LCD monitors are great, but strangely their TV's aren't very good. I suppose that makes sense since they are computer makers.
From what I've read, Panisonic has the best 42" and 50" plasmas for the money, but because they are professional models and, in that, pretty basic, you have to spend a little extra to add conections you need and a stand if you need it. It's still the best deal and you can just add the connections you need.
Check out CNET's reviews. Right now I'm trying to decide between spending money on a Panasonic 42" plasma tv or a Dell 30" monitor.