I'd get an iPod and a GBA (SP, if possible). The latter because it is simply THE BEST portable game machine ever created. I don't know if I'm the only one to consider it that or not, but that's only my humble opinion. And then, I'd get an iPod, which seems to be a new worldwide hit and - of course - it's very useful.

It's all up to you: if you think buying both wouldn't be a "money well-spent", don't do it, but those are definitely the choices I'd consider.

Hope it helps.