I went for the top of the line 580 EX II, though I suspect I would have been fine with the 430 EX. I love the thing and my indoor pictures have improved dramatically since I got it. I always bounce it off the ceiling (or sometimes a wall) and get great results that way. The 580 has a great range and, if you think you might add flashes and use more than one at a time, the 580 can act as a master to the others--not something I've tried.
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