Plasma's biggest issue is the reflections off the glass screen, but it must be said that if you have had DLP for years, you likely don't truly have major issues with your room that would negate plasma. DLP is 'dim' compared to plasma, and DARK compared to LED/LCD displays.
If I were you and I could afford it, then the Panasonic 65" VT series plasma is THE best out there.
The best bang for the buck is the Samsung PN64D7000 series. That's a 64" plasma and the one I ended up with this year after some serious reading and consideration. The D8000 series from Samsung is a bit of a step up, but doesn't seem to offer much more of what I was interested in for the money. Likewise, the GT series from Panasonic is very good, but doesn't seem to be quite as good in image quality as the D7000/D8000 series from Samsung... BUT - Potentially I think Panasonic may be more reliable than Samsung, so you may get a tiny hit on overall image quality, but longer reliability, which has a serious cost consideration to keep in mind.
I would avoid LG, which often has good deals, but in my experience (not opinion) is FAR to unreliable of a manufacturer.
For LED/LCD, Samsung and Sony lead the pack, and Sharp is pretty hard to argue with on their 70" displays. I don't think the Sharps are in the same league as the better Sony and Samsung displays, but in the middle of the pack for sure with decent build quality... Really, you can get a 70" or 80" for a very good price from Sharp with decent reliability and overall quality, so it's hard to argue with. I will very likely get their 80" in my family room next year if money allows.