I would ask him how much he is charging for installation and the motor. Than you can price how much you can spend on parts and see if you can get everything cheaper or your getting ripped off. That's what I did.
I went to
http://www.xatracing.com over here in Florida and here is there stage 2 package
SR20DET REDTOP stage 2 performance pkg includes: SR20DET red-top motor-set, GReddy 3" Downpipe, Greddy Turbo Timer, Greddy Profec B Spec II Boost Controller, Walbro 255 Fuel pump, Greddy type-s BOV and flange welded to hot pipe, 3" custom cat-back exhaust (choice of N1 style or drager style muffler), Greddy V-spec frount mount intercooler, Flex-A-Lite dual 12" electric fan, new small battery, all fluids, NGK plugs, working and charged a/c, power steering, and installation of motor and all parts. - $6000
So I feel like you might be getting ripped.