I'd go with a 2.1 built into your block (as long as it's ok) full build with Cosworth gaskets and unrated studs as well as pistons, rods and crank.
If you go STI you will have the issue of not having the ECU for the AVCS, I know you can run with it disconnected but you'll always feel like you need to sort it out which then means aftermarket ECU and more expense.
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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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