Should i buy a Samsung 50IN PS50A558S1FX 1080P Plasma?

iv'e been looking at this in the argos catalouge and it sounds perfect, price and all! but is it worth it? i was looking at the worlds most expensive tv (out of curiousity) and the contrast ratio was 5000:1 and the tv which i want is 20000:1 so is it the lower the better? anyways i would be really gratefull if anyone can help :) and please answer my question properly, last time i posted on here most answered with answeres not even related to my question :P thanks everyone for your time!!! p.s please check out the specs of the t.v before you comment, thanks again :)