It's not necessarily cheap but that new <a href="http://www.target.com/gp/detail.html/sr=1-2/qid=1162187511/ref=sr_1_2/601-9388530-5152167?ie=UTF8&asin=B000GHGY34" target="_blank">Kone by Dirt Devil</a> looks like it may suit the job well, plus it is stylish (if you care about that kind of thing). You may also want to assist with the dust removal by also using some canned air at the same time.
Vacuums don't really suck up dust that well thats is inside of a computer, in some cases 'baked' on. Try using some of <a href="http://www.newegg.com/Product/Product.asp?Item=N82E16899888208" target="_blank">http://www.newegg.com/Product/Produc...82E16899888208</a><br />
it's found at all computer and office supply shops.
I find using a can of compressed air w/ a vacuum hose next to it works best. Just hold the hose where the dust would be going so the dust doesnt settle again. Q-tips are awesome for getting the dust that is in the middle of the HS fins and edges of fans, ect.
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