Nice budget. If I were you, I'd sell the 1zz. It's both weaker & older. Get that 2zz and send it on over to Jay Hass for the Hass turbo & the install. He's up here in the North East. If you got money left over, build up the internals with parts from monkeywrench racing's website & then send them over to polydyn in Texas for ceramic coating and for better protection for more gains & boost. Boosted 2.0 promotes their ceramic coatings now. And if you have even more money leftover, get a top notch stand alone ems, an evolving tune, perfomance radiator, moroso oil pan, oil cooler, cooler thermastat, better fuel pump, new oil drive gear, & anything else you can think of to squeeze out reliability. Light weight 15 inch rims with drag radials wouldn't hurt either.
Even though I'm 50/50 between a s/c or turbo, what's your reason for pouring $10-15 G's on a FWD celica?