as ethel says - any dongle SHOULD do ... but like world peace (and a zpen working on a eeepc ;-)
the Ideal isn't always reality.
there is always the chance that you may find there are issues with dissimilar kit.
It's not essential .... but it might be easier if you stick with netgear.... (they tend to be reasonable on price anyway ... )
(now for the soap box bit) - basically wireless should always be the last option - wire is far better in every way - because most computers use electrickery homeplug is just as practical as wire - then there is wifi.
http://www.broadbandbuyer.co.uk/Shop/MFR/Group .asp?ShopGroupID=61&SupplierID=1
on a desktop you have the added problem of stuffing an aerial behind a big metal box .... never a good idea.
if you must ... your dongle should be connected using a USB extender (male-female) so that you can position the dongle for best reception