You could always piece the setup together. I think a T3super60 turbo should max you out at about 300whp w/ a nice spool up. I'm sure you know this, but w/ BT you'll always need a new exhaust mani, possibly custom inlet piping, software, injectors, maybe a wastegate, custom down pipe, etc...

ATP makes kits that utilize the stock turbo location. You can hook it to you stock mani and DP. You will need the atp inlet pipe, software and injectors too. Getting a higher flowing mani is always a plus. I know the GT2X turbos have a nice quick spool up and can get you close to 280-300 whp. Check out http://www.boostfactory.net for the kits. Check out the 1.8 Tech forums on the vortex. There's a ton of info on these kits.