Replying to HELP

okay so my g/f birthday is very soon. Shes very hard to shop for, seeing as she has no idea what she wants. Every other holiday ive gotten her the usual, jewelry, clothes, shoes, flowers etc. I was considering getting her a gameboy, cause she always plays mine. Im torn between the gameboy DS or the regular advance SP. Shes not a nerd about video games but she would enjoy it. So should i get the advance which is cheaper or should i get the DS which is more expensive but way cooler. Is the DS worth the extra money?
Also if anyone has any creative ideas let me know.