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take a look at the Z1 Stage2 turbochargers. We have been having great success with them and they perform incredibly well for a $2K turbo upgrade. They will make 32psi of boost peak, but nominally you can run ~20psi on a stock engine and we've made a solid 550RWHP and 550RWTQ from them on an entry level performance engine with basically only forged pistons and everything else stock - they always make just about the same HP and TQ at any level and reach full spoolup by ~4700RPM. Unfortunately these turbos haven't really made a hit in the public's eye although we sell quite a few of them. Its design is basically a disco potato with a different turbine section. That 62-trim compressor wheel is just too awesome for our engines, but the disco potato's high A/R on the turbine housing and 9-blade wheel makes it somewhat laggy in comparison (workable with things like manifolds, cams, etc) but the disco potato (Z1's stage3 or JWT700) is really designed for a higher-revving-than-stock engine with proper camshafts to take advantage of its higher RPM torque production (for greater horsepower). Really though, the free-er flowing turbine secion of the stage3 apparently doesn't generate enough backpressure and torque suffers through its powerband - the stage2's outperform in the torque department by a significant amount and they have the same compressor wheel - just a little more restrictive exhaust side and its spooling quicker and producing more torque. Some backpressure is necessary to keep the torque up through the midrange. But it is all a tradeoff - if you want a high-revving engine to make power all the way to 8KRPM, the Stage3 is a good choice, but if you want a more responsive turbo with excellent midrange torque and more responsive spoolup for streetability, the stage2 is the way to go. Personally, I like more torque - its the force that turns the wheels and ultimately, puts you into the seat. Torque = fun factor - Weeeeeeeeee! Z1 entry level performance engine, forged pistons, ported exhaust manifolds, spearco intercoolers, 555cc injectors, AshSPEC Stage5 ECU program, dual intake, downpipes, testpipes, ud pulley (Jeff Baughmann's TT - STEELZ) Keep in mind, this was on VP110 race fuel and ~28psi of boost. The car made 480RWHP and 475RWTQ at ~20psi on pump fuel.
Stage2:  Here is a link to a recent Sport700 dyno on a fully-built engine (hey GotBoOst) 592RWHP and 530RWTQ. You can see that at 592RWHP it was producing 530RWTQ, which tells us that it made that 530RWTQ at a higher RPM but it maintained torque better as RPM increased. But again, I'm a torque fan; it makes the pull into the seat that much more exhilirating.
[ http://twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=1280810 ]
Nothing against JWT, but I would stay away from the 535BB turbos - they dont even compare to either of these other two (Sport700/Stage3 and Stage2)
Just keep in mind though, they are a different feel of turbo. The stage2's progressively and predictably pull harder and harder to 5K whereas the Sport700s/Stage3's wont come on as strong, but you'll have more time in each gear as you wind the engine out more. Just keep in mind, the more RPM, the more wear. YEah, I guess I'm partial to the Stage2's. :) Good luck with whatever you decide on - they are both good choices!
[ ashleypowers.com ]
[ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] [ Z1 Motorsports Website ]
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I know I'm partial to my children, but you might want to - 
