What is the best route on building a new celica engine Options

[dugunz]

OK here we go. Right now I dont have a celica (due to an accident it was tottaled) but now im in the market to buy another one. This time around I wanna build a bad ass fast ride ride though. I always loved my old celica st but it was slow as hell. I guess my question is - Whats the best route and cost vs. speed to get the most power.

1. Should I get a GT and have the motor rebuilt and bore out the heads and the whole nine and turbo it?
(what kina HP would I get from doing that)

2. Should I get an ST and do a 3sgte swap from a clip
(if I did that sould I have the engine rebuilt)

3. Which would be faster, stock 3sgte or rebuilt GT turboed

4. Which would be cheaper or atleast more cost effective compaired to power. (and labor)

Keep in mind that a mechinic shop will be doing all of this. Im not really to good with engine and mechanics. Im more about interior and exterior styling. But I do know a mechanic and he said to take the engine out and put the same one back would be around $500 plus whatever I decide to do at the rebuild shop which hes not involved in. He is recomending I do this insted of a swap. What do you guys think. Also keep in mind that a clip is somewhere around $1500/$2000. Should I just spend this money on getting all that I can out of my original motor or is the swap really worth it.