This isn't really a subjective thing, the pios are that much better than everything else on the market, just have a look at the reviews especially on HDtv test and by phil hinton on avforums. It's not like comparing speakers and choosing between different sound signatures, the kuros are leaps and bounds ahead of the panny.
Also the kuros can be made to look stunning by inputting the bumtious settings off avforums. It's the closest you will get to attempting your own calibration, but getting a pr0 in to calibrate the set is preferable.
I'm not saying the pannys are bad, I actually think the PX80 is terrific value, but it still can't get anywhere near the Kuros. I know I seem like a fanboi, but hell yes I am, I spent many months demoing every possible set on the market before getting my 8G, and then spent another long time comparing the latest sets 5months after I got that before I saw the 9G 5090 just before it was released. The hype is justified, and with the OP specing a budget of £2k then this is the set to go for. If you say he should jsut get a panny, it is like goinginto motors telling someone with the money for a nice 5 series and considering one to forget about it and get a ford focus, as it's still a good car and cheaper. But will never be as good as the BMW, or what the spec was for.
If in doubt get yourself a demo of the 9G at a proper dealership, just check the assured advertisers on avforums, the main ones are where the renound ISF calibrators work and have a good reputation that is well deserved. Only at a proper dealership with a properly lit room and calibrated set wil you see how good these sets are, brghtly lit shorooms with horrifically calibrated sets are not the place to demo proper tvs in action.