don't go 2tg or 18rg, i've had a 2tg and just brought an 18rg. The 2tg looked good in theory when i brought it, but once it shit itself i was looking at big dollars for a rebuild. 18rg, i was lucky enough to get a car with one installed and all the parts were there, but everytime i walk into ANY parts stores they twist their heads and scracth their fanny as soon as i mention 18RG.
My opinion, go 3tc IF you can't afford 4age. Cheap, reliable, good power can be made. But they still arent a 4age.