It makes no difference to me personally, however I did spot a few other references to the camera else where, for example trawling through my own hard disk, I see...
/CHDK/WINGUI/DE/trunk/trunk10/platform/ixusW_sd430/
Note the capital -W-
I think there have been a couple of other stabs at porting this camera in the past, so perhaps going for ixuswireless_sd430 might keep things clean and ensure we don't trip over any of the old clutter.
A quick tidy up of any legacy ixusw and ixusW references might also be a good idea.