I am in the market for a big screen DLP television. I currently own a 6 year old Sony 61 inch CRT RPTV (it is not high def). I recently vistited a number of stores and have asked questions about 1080 vs 720.
I have been looking at the new Mistubishi line model 628's, the 62 inch version. This unit is a little pricey for my budget, but I have seen some of the 720 models that are lower in price point now that they have to push the new 1080p machines.
The saleperson at the store tells me that 1080 is the way to go (no doubt)...but presently, to my limited knowledge, there are no true 1080 signals being sent over cable (which I have). I watch DVD movies a lot and I get Digital Cable (not HD) from Comcast. I have watched these 1080p televisions with a 480 DVD signal and present HD broadcast and it does show artifacts and that screen door effect everyone talks about. When they show a 1080 signal it looks absoultely BREATHTAKING!!!
I have a large DVD collection I don't want to have to replace all of my DVDs.
I was in a Tweeter store and they had a Mit 1080 next to a Mit 720 and I swear they had the 1080 raised to the MAX to try and sell them. The salesperson kept on saying "look at the picture how much brighter and better it is!!!!" I personally liked the colors and tone of the 720 Mit on display better.
Any and all advice would be helpful, I know the salespeople are just doing there job trying to push the latest TVs.

My question is; Will the less expensive 720 DLP be a bad choice???
Any other suggestions to brands other thatn the MIT???
Even if the signals go to 1080 in the future will the 720 still look great?
Will Blu Ray or HD DVDs will still look great on the 720?