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Well, this thread has a few ignorant opinions!
Here are my thoughts.
MR2: If it is a new MR2, don't waste your money unless you plan to do an engine swap or waste money on building the internals. If it is one of the older All Trac turbo MR2s, then I would say go for it.
RX-7: Don't bother unless you like spending a lot of money for gas and repair bills and like smelly exhaust. The RX-7s engine has too much port overlap allowing exhaust to be in the combustion chamber when the rotor comes around to fire. This caused the car to stall at idle so they compensated by using more fuel at idle. This also makes for bad air in the combustion area, never good. It also makes for stinky exhaust fumes. I also hear that the RX-7 is a handful to work on and you have to work on them a lot, namely seals I hear.
Eclipse: The 4G63 is a GREAT engine to work with namely the first gen engines and third gen engines from 1998 - 1999. They can take a good amount of boost on the stock internals and they have a huge amount of aftermarket. They are also reliable engines as well. The 4G63 is nothing to laugh at. Also check out the build up guide in this months Sport Compact Car. It is a great guide on how to build up and tune your 4G63, VERY informative. Also that info can be related to other engines and applications.
My choice is the 4G63 without a shadow of a doubt!
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