Originally Posted by gatornavy25
There's a huge difference between bluray and DVD, even on a 720P set. Wider color gaumet and sharper picture are two of the major differences. A 1080P plasma will of course, be a little sharper with bluray. Do a search for "720P vs 1080P" and look through all the debates and great info. I've got a sony bluray player and a 720P Pioneer Elite plasma, and I'm still floored everytime I pop a bluray in. I can barely stand to watch a standard dvd anymore. I've been spoiled.
The quality of the source material is the most important factor in achieving excellent picture quality. Right now, BD is the most pristine source you can send to your plasma. A well mastered blu-ray disc will look significantly better than its DVD counterpart even on a 720p TV.
If you decide to upgrade to a 1080p television, the amount of visible benefit will depend on your viewing distance and the quality of the TV to which you upgraded. If you go with a bargain basement 1080p set, the overall picture quality might look worse.
EDIT: The only 1080i native sets are CRTs and some Hitachi plasmas. Don't worry about 1080i sets unless you're planning on buying an HD CRT.