There's no "ifs" about it mate, I chose revo, and bought a SPS1 to go with it. (i wont mention the other stuff i've done, it reminds me how much the bloody car has cost me!)
Also did a full milltek (from turbo-back) stainless exhaust at the same time. A good panel filter and smoothed out air box is as good as any induction kit on the market for the mk4, and I have the proof to back that up in the form of MAF logs taken by vag-com (thanks gary m

)
You'll want to uprate your diverter valve because the flimsy plastic diaphragm tends to split at higher boost pressures created by remapped cars.
Standard clutch in good condition is suitable for up to 300lbft torque and you wont get anywhere near that without slapping a bigger turbo on.