Norwegian Wolf

Have a Sapphire Cosworth 2wd that needs a new turbo.
Have ran a Garrett T34 a/r .63 stg.3 hybrid turbo with cutback blades etc. at 2,1 bar
30psi on it until recently.
But this broke e couple of weeks ago.
The turbo has been the limiter of the engine, and now i want a bigger turbo.

spec:
200block, new balanced crank, polished and weightbalanced conrods,
JE lowcomp pistons, highpressure oilpump, professionaly portet 2wd head,
full head job, solid lifters, specialmade cams (about the spec of BD16 cams. could post the spec if requested), adjustable Kent camvernies, greys (Bosch 403), plenumspacer,
MSD 6A ingitionmodule, Mallory coil, 400chip, Ford Motorsport plugleads, NGK sparkplugs,
RS500 intercooler, 3" Mongoose, Bailey turbodamper, 2wd manifold, 3 Bar MAP-sensor, KN filter, Grp. A headgasket, ARP-studs, Grp. A cambelt and tensioner, bigger fuelpump, Samcos, hd bearings, new waterpump etc etc.

And i am going for a bigger spec this winter.
New exhaust manifold, swedish style inlet, bigger injectors (650cc), remap and new bigger turbo.
But the question is, which turbo..
Have thought about a GT30 (71/76..), Turbonetics T4 of some kind, Garret T4 BB or something like that. No preference actually..

I haven't got the need for breaking 500hp, but 450+ with pretty good responce is what i want.
Any ideas? Whould highly apriciate any ideas, or tips about who i could ask..

Running 3,62 Quaife now, but changing to 3,91 this winter.

Will be used mostly on the street, but also on trackdays.

Kristian