Hi!
I don't know where in the world you are located, or if you already bought a case, but there is in fact a PC-P50 case modified for watercooling. It will accommodate 1x140 or 2x140 Magicool radiator. At my request Lian Li made some minor changes to the top panel (not bezel) and included 140x140x20mm thick fans instead of the 140x140x25. Mounting is quite easy, you just move the 140 fans inside the case and put the radiator where the fans were. AFAIK now other radiator will fit. Neither will 25mm fans do as they will slightly overlap the mainboard by a few mm.
However, the case is an OEM case is only for sale in Norway.
http://www.microplex.no/WebPages/Produkt…spx?plid=144582
I think Lian Li have some extra top panels and fans. If the Lian Li distributor in your country is serviceminded they may get one for you so you can replace the standard top panel.