Thinking about swapping into my 7afe a new engine, Engine swap Options

[Celica94ST]

I've been reading the feasible engine swaps and it looks like for my 94 ST that the 4AGE blacktop would be the best fit, though I am liking the 4AGZE I don't think its neccessary for me at this time.

I guess my question is, has anyone done a successfull swap like this before into the ST?

Any pitfalls they may had had?

I found some ebay listings for some blacktop engines, but have heard that its not a good idea to go that route?

And the stock tranny should bolt right up to mine?

My car has right now 315k and its using oil alot more in between changes, I am fixing to have alittle bit of money from selling a truck and am weighing out my options.
I love my celly but I want more power and it looks like I wont be getting rid of it anytime soon, so why not put more life into it.

I was wondering though price wise, what would be a realistic price for a completed swap?

Also, anyone know of a reputable dealer that I could get a good clip from?

Thanks guys