Start with an S14/15 DET if you can afford it. The VCT will help you and the piston oil squirters are nice to have. Use S14/15 DE pistons in it and some big cams and that will make good power (by NA standards)
A mate of mine is making ~125rwkw out of an S14 DE with PFC, big cams, DET injectors, extractors and an RB25 AFM. Revving past 8500.