Totally depends on what spec you want, i forget what mine totalled but it was a lot

Paid £120 for slivertop engine, £800 for carrillo rods, £650 wiseco pistons, £150 for bore and bearings, another £100+ for gaskets, bolts etc, £800 for roller barrel inlet, custom plenum, modified 200sx exhaust manifold, turbo, external wastegate, piper BD10spec grind cams and spring and pulleys £650ish, DTA ecu £550, custom loom, siemens injectors £200ish, custom fly as it was rwd using a T5 box, helix cossie 4 paddle clutch, braided hoses and dash fittings were a shitload and mapping.

Of course you can do it cheaper, some just use a 1.8l silvertop, skim 1mm off the pistons and run as is for 250bhp. But dont expect any more.