the Samsung f8500 is also worth consideration. in a lot of ways, it's 'eases' an LED user into the plasma world. it has a brighter image, and the pixel structure looks more lcd like imo. it's also a fantastic tv, and if not for the the vt60 and zt60, would have been the new reference television. but hey, two companies releasing great TV's is even better!
imo, ST60 is the best value. it's like 90% as good as anything else out there at only 60% the price. in a store setting I spent about an hour comparing the st60 to the vt60 using my own material and was a coin flip. i'm assuming in a better viewing environment the extra contrast and deeper blacks would be more noticeable.
have a look at:
there's plenty of info on all of them on these forums already. decide what matters most to you, and how you want to use the tv, and you should be able to figure out which model suits your needs best. and they can all be found for 3k or less