I'm looking to spend about $300 on a laptop, so I'm not tethered to my desk when doing homework. It just needs to be able to play music, surf the web, use word/excel, light AutoCAD work, and light photoshop work (by light I mean copying/pasting printscreens and arranging them in a document or making a few lines and circles in CAD). I might install Kubuntu on it if I decide that I can work with Linux equivalents for PS and CAD and can find a windows emulator for this old program used for one of my classes. Think I can find anything? There's some Lenovo X31/T30's on eBay for about $300 with 512mb RAM and 1.8ghz Pentium M; this should be enough, right? Anything I should look out for when buying this old?