Contrary to what "morson4x4" has said, a few people I know have had nothing but issues with Pro-Comps ie leaking. Relatively speaking they are cheap, however if that is what you are after then speak to David @LLama4X4 about a set/pair of Rough Countries. I would personally pay a little bit more some; Ebay have a pair of (gas)
Monroe's for 90 odd quid, and my mate got me a pair of KYB Gas-Adjusts for £70 (before I upgraded to Old Man Emu's). If I had stuck with normal oil filled shocks they would only cost me £30 for a pair. Just my opinion of course..