I'd definately go STI now given the cost of getting just the box and brakes up to STi spec if you stay WRX will be around £3k.
Depends on age/cost but options are iirc:
Pre 2005 UK spec = 6 speed (long ratio) 2litre
Post 2005 UK = 6 speed (long ratio) 2.5 litre wide track
Pre 2005 Jap = 6 speed (short ratio) 2litre
Post 2005 Jap = 6 speed (short Ratio) 2litre wide track
A lot depends on what you want to do with the car - the JDM cars are generally better spec'ed, the heads are often better and they make more power like for like, however the gearboxes have shorter ratios and for motorway/autobahn driving are irritating as hell (approx 4.5k rpm @ 80mph). The JDM cars did not have the 2.5 so are 'stronger' engines than the UK 2.5's however the UK cars have bags more torque so it depends on driving style - (UK 2.5's will go to 450 or so without too much trouble).
I like my 2.5 with the low down pull however the JDM box I have will be swapped for a UK box with DCCD when funds allow!
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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