Just seen this thread, a couple of comments from an 'enthusiastic' driver! I have used Dunlop Sportmaxx (not RTs) on my XKR, both front and rear and they were significantly better than the OEM Pirellis. I swapped to Toyo T1Rs, then T1 Sports due to issues getting Dunlops in that size but IMO Dunlop are a pretty decent tyre (as indeed are the performance Toyos).
Looking at RCZPerformance's Michelin recommendation though I can highly endorse
Michelin PS2's, I used to run them on my 306 DTurbo and I think on my 406 Coupe if I remember correctly... If you are a
Costco member you can get them for a pretty decent price too (as they are a bit steep compared to the others, but you get what you pay for)!
Talking of price, worth checking out:
http://www.blackcircles.com/
http://www.tyretraders.com/
http://www.camskill.co.uk/
http://www.tyrewizard.co.uk/
http://www.tyredrive.co.uk/
http://www.topgear.co.uk/
for decent prices. I buy online (unless my local fitter can get near the price!) and then take them to my local fitter who uses a Hunter Road force balancer, which is a SUPERB machine at getting the balance weights in precisely the right place as it actually puts a roller on the tyre to simulate a rolling road loading.
Also worth mentioning
Tyre reviews, which I use to check out the grip and aquaplaning characteristics as well as general reviews, to get some idea if they are any good! 2014 Autobild Top 15
HERE
Personally, I will probably go for the Michelin PS2s when it is time to change as they are VERY grippy, although they do wear faster than the harder compounds obviously - as said previously, you don't get 'owt for 'nowt!... :thumbup: