lol
With a home console, the look isn't important to me - I have bought an xbox and a ps2 under the full belief that they are exceedingly ugly bits of hardware (whereas I like the look of the gc, dc and ps1/psx)
With a handheld console however, it DOES matter, because instead of staring at the television, I have to stare at the console itself. The plastic quality of the ds looks very poor, and some parts of the design are clumsy, poorly designed and overly large. To my taste, ninendo's design of handheld consoles is usually a thing of beauty but the ds is really rather clunky to hold, cheap looking, and poorly designed. The hardware inside is great, I love what they are doing with it, and I have played some really cool and original games on friends and relative's units. But the little things that niggle me about it annoy me to much to buy one for my own regular use.
The PSP is beautiful to look at, but there are some serious internal design flaws, and a stupid price tag which put me off buying one for long term use, so out of the two I'm more likely to buy a ds. In fact I was seriously considering getting one soon so I can play a few of the games I want for it. However now there's a new design, I may well wait to see if I like the new one better, as being I'll have to look at it for long periods of time, I'd rather it looked "nice" and like I'd spent money on something that has been designed, (and built) properly