Dell's prices are good with coupons 'n' such. Even so, their own branded displays are not always the best, particularly the entry-level ones. If the USA deals aren't available in the UK then definitely widen the search. Check out their support forums, hardocp and arstechnica.
Last I was aware, it is still a compromise betwixt speed and colours where the "fast" gaming panels offer 16.2 instead of 16.7 million, and manage those by rapid switching from a true pallete of around 262 thousand. It prolly ain't a significant difference but for the highest levels of photo publishing and CGI. Our noggins allow us to enjoy "moving pictures" &c. so I reckon if the desired effect is achieved then the technical details don't matter much.