The price for 602z is $10xx in SG. I'm not too sure of the 730, but it looks great, only that it uses SM as a storage.
I would choose the 602z cos it looks better and more manual features although yes 6x zoom.
I kinda like the pro-feel. 730 is not too bad a buy also.
The 5mp cams are really good should u be able to afford it. Otherwise 602 or 730 would do just as well.