[Gaming] Best display for gaming under $3,000

Hey guys I've been using a Plasma TV (Panasonic TH-50PH9) for the past 4-5 years hooked up to my PC as the centerpiece of my entertainment system. The TV has started showing it's age, it's only 720p  

So I feel I'm finally ready in the next month or so to buy a new screen.

My list of importance goes 1)Gaming 2)Movies.

So here's my big question.

What would better...a 240Hz LED/LCD tv or a 600hz Plasma.
Which technology will handle motion better?
I've read a lot of reviews on the matter and people tend to say plasma over LED/LCD. What do you guys thinK? Also note that image retention is a non-issue with plasmas. I've passed out in front of my plasma with static images on the screen all night and it's never been a problem, and that plasma is almost 5 years old.

Would a desktop monitor like a Dell Ultrasharp perform better than say a Samsung UNB8500 when it comes to motion?

Also another note is that there is nothing wrong with my Panny plasma. It's just not 1080p. I have no complaints about it whatsoever.

So my options are.
PLasma
LED/LCD 240hz
LED/LCD 120hz


Thanks in advance for your help. If Sears or Amazon would let me just buy TV's and return them with no restocking fee I wouldn't need to do any research.