The motor will work fine... but I'm not sure if the top mount will clear the engine lid. If not you will have to but an MR2 intercooler and piping... which would probably make the cost the same. Not to mention they would be selling it to you with an all-trac tranny.... so you would have to go out and buy an MR2 turbo tranny and axles unless you wanted to use your NA one which wouldn't last too long.
And to top it off..... I'm 99% sure that TotalJDM doesn't have any 3sgtes..... make sure you ask them before you make any huge plans. If they tell you they will have them in 4-6 weeks... that means they don't and won't have any.
Hope this helps.
PS... these guys are pretty close to you
http://mr2warehouse.com ... they have good pricing and i've never heard a bad thing said about them. They regurlarly get 3rd gens in too if that happens to be a way you want to go.