The my g/f's 300ZX, my GTR and my soon to arrive MR2 GT, I bought thru Prestige Motorsport and have done all the compliance myself.... everything was pretty easy, but it would be far easier if you don't have contacts to just buy something already here.
The clear short fall of buying sight unseen is that you don't really know what your buying until it arrvies, PM's inspect reports are pretty close, but in the case of the GTR they didn't know that the turbos had sht themselfs.... a costly couple of components if unlike me you didn't already have some spares waiting.
Compliance costs are generally around $1k extra for 4 new belts etc etc, plus rego, plus a service, plus a good cut and polish and maybe some bodywork, new stereo and maybe tyres, pads and rotors.... by this time your fast approaching the same price as an import dealer car that you get a warranty with.