agreed! get the forge splitter one, its adjustable so you can adjust it pending on state of tune and you can always run it on recirc (£98) on fleabay
there's an apr one (available from awesome gti
store) its meant to be pretty good too, its diaphram based and as a result is faster reacting than the piston based items in theory better as you should loose less turbo rpm's??
of course you could always get a launch control set up... a good one will allow flat foot shifting meaning you never come off boost (a good santa-pod toy)