Forget the 1JZ swap... ESPECIALLY if you're paying a mechanic to do it! It is not what I think of as a terrible swap, but it is involved.... some people do think it's miserable though.
Definitely go with a 7M-GTE swap, but you're right, you don't want to just drop it in either... it should be carefully inspected and anything which needs attention should be taken care of. There's a lot more to turboing a 7M-GE than you seem to think. Get the GTE, rebuild it and drive with the GE until the new engine is ready to be swapped in.
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