lookin to buy

i have a couple questions for you celica owners out there. Im lookin to buy a new car, so far I have looked into mazda mx6, nissan 240sx(kinda spendy), and i test drove a 95 celica. My only concern with the celica is the lack of power and I cant seem to find information on celica motor swaps, so far I've heard that st205 and 3sgte motors go in there, but no info on how or how difficult of a swap it is. Any information, websites, links, would be greatly appreciated, Im only really interested in the 94-99 gen. thanx