okay upgrade diffrences and lense flapping quest?

I have what so many call an entry level crt a 1270. I've been thinking of upgrading but to what? After talking to some calibrator, I wonder if it's even worth it? As it was explained to me a pj with higher resolution is important, but let's say that you are running a resolution lower than the pjs maximum and have reached a level of clarity, then is it necessarily useful to go to a pj of much higher resolution? electromagnetic focus a sweet spot in fine adjustment, but dosen't the lens flapping which as stated will give a much sharper image be the same? the only noticeable difference that I could see is bigger tubes and brightness, ami wright or just totally screwed and confused. I've been looking at the Barcos, or the Marquee's tho to me they are ugly sorry no pun intended. I was considering a NEC 9000 extra but its no different than mine except the higher resolution. Your comments will be greatly appreciated.