The Ixus models past and present do not have a true manual mode where you can control both shutter and aperture. Its so-called manual mode just allows you to control white balance, ISO setting, exposure compensation and some others.
Hi i'm using an Powershot A75. But i reccommend A85. Cos the LCD can swivel one. Then it also has manual mode for you to learn. I'm using budget camera so i only have enought to buy A75.
Furthermore you can buy tele or wide converter and fix on ur cam. Cool. Should try it. A80 or A85 i think if you not familiar with wat exposure, composition, or flash or shutter speed that kinda stuff.
But the Powershot doesn't look as suave as ixus. *sad*. But who needs style when u have quality.?
And the settings look not very different. Besides the 10x zoom and macro and image stabilizer. I don't think it has anything very different from Powershot series. Maybe if you wanna spy on ur neighbours haha. Still can buy adapter to fix on tele (wow!) and wide-angle lens.
But for the video recording thingy might be useful although powershot can also do it but at slower speeds. It supports type 2 CF Card too!
The flash on the top might reduce more red eye than the Powershot.
Actually i kinda like it if i have the cash. Hope i have been of some help coz i'm a newbie too.