this currently resides in my shed I do use it for other tasks so its sole use isint cleaning out computers.. but that is one of its uses..
( I bought this a few month back when I was down sizing as my old one was a 250L snapon job that wouldn't have fitted in my shed )
If you can get a small one cheap why not.. you can buy ones with a tiny wee tank that folk use for model painting and stuff like that.
If you think you can use it for other jobs and it will serve a purpose buy a half decent one..
I mainly use mine with air tools ( die grinder, air ratchet, air gun, )
mines does serve a purpose as I use it as a workshop tool. Ive even used it to paint the garden shed!! it also came in handy for building the fence with a nail gun.. and its great for blowing up the kids pool!! if you can use one for other jobs buy a decent sized one and a belt drive. if you're only going to use it on the odd occasion to clean out a tower or a hover ( yip its good for that too my misses has discovered!! ) then buy a cheap direct drive thing as small as you can find. even buy one 2nd hand