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Sonic said:
That temp Mac idea is good - would I need to buy it from the Apple online store to restock it?


AFAIK you have only 10 or 15 days limit before you can return your Mac and claim the money back(minus the restocking fee). Which might prove useless for you if the Merom Mac takes more than that to reach you.
 
Wait for WWDC then you can make a choice..but i'd say Mac Pro(if you have a nice screen for have the cash to shell out for it)
 
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