Well, my 2 cents is to go with the Rebel. I really have a problem framing with the P&Ss - the viewfinders aren't all that accurate and the lcd's aren't very visible in bright light. I've only looked at a couple of EVFs - and am not impressed with them either. You might miss the movie mode.
As I recall Michael did a 8 mpx P&S "shoot out" - try a search of this site.
You'll have more options lens/fl wise with the Rebel (both a:
plus - range of options plus they will migrate (more or less) as you upgrade bodies and
minus - cost, more stuff to carry, not as easy to get the same 28-200 equivalent coverage)
and less noise.
I think the dust issue is blown out of proportion, but at some point you'll have to deal with it.
