If you’re buying an Eee PC with the intention of hacking it physically to add hardware modifications like extra storage or bluetooth dongles and the like, the 2G Surf model will make it harder for you because of the absence of the bottom access cover in the chassis. A photo in this review of the 2G Surf clearly shows this possible problem.
Aside from the physical restriction, the processor used is a slower Celeron–M 800 MHz running at 571 Mhz, unlike the 4G models with the 900@630 MHz processors. The 512 MB DDR2 ram is also soldered in place, so a quick memory upgrade is out of the question.
Get the 4G or 8G models instead and hack them to your heart’s content.