Hi all from New Zealand

I'm after a new turbo for my 1988 Sapphire and was wondering if anyone could give me some sound advice on exact product numbers for the GT30, what exhaust housing is best, prices etc, internal vs external wastegate.
I've spent a good hour or so doing a search for "GT30" on this site and could only find a few posts about them so i went ahead and made a new post
Originally i was going to buy a T34 but have since changed my tune and have been told a GT30 is the better option in the long run
I know my car isn't a 500 HP monster yet but one day I hope to have it around that figure so I don't mind having an oversized turbo for my car for a wee while.
Here's what I currently have...........

Bosch 803 Green Fuel Injectors,Ahmed Bayjoo Chip, 3 Bar Map Sensor, -31 Wastegate actuator. Pace RS500 Spec Intercooler,Bailey breather system, full set of Red Samco silcone water and boost hoses, K&N panel filter, Bailey DV-30 recirculating Dump Valve, Bailey Power Steering and Header Tanks, Group A head gasket, Mongoose 3" Stainless Steel Exhaust System
Koni Adjustable Sports Suspension front and rear, New Chassis Dynamics uprated springs front and rear, New Ferrodo DS2500 fast road/track brake pads front and rear and a Philloy Front Strut Brace.
The car is only running 18 psi of boost on the standard un-moddified T03 Garrett turbo

I know my current setup is pretty piss weak but I can't be bothered buying a T34 and then in a years time having to fork out for a GT30 or some such.
I'm pretty set on buying a GT30 unless the likes of you all knowing chaps change my mind
If anyone could tell me which GT30 would be the easiest to fit from "garrett's" website that would be a big help when it comes time to order one
http://www.turbobygarrett.com/turbob...ochargers.html

Thanks in advance guys n girls and sorry about all the 'noob' questions