Get one with 802.11n technology, its the newest and fastest one, (300mb transfer and 70m signal radius)
I just went and spent £95 on the D-Link DIR-655 haha :P (amazing for downloads and gaming)
oh yeah and whatever you are using to receive the wireless signal downstairs (if you havn't bought anything) get it with 802.11n too, if not at least if you get a router with this, it kinda future proofs you
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