At the end, if you decided that you need Microsoft office or decided to buy one, I would suggest to hold on that plan until they released the newer version on '08 that runs natively with intelmac machine.
But as other suggest, you can use iWork and neo office, just save the file using save as to microsoft office format.
Good luck.
ps: some font that you use for presentation using neo office or iWork that is not default for MS office, might be displayed slightly differ using similar or any font close to it.