I never had a problem playing games online with my b router, and that was with a card that liked to pretend it was getting next to no signal. Unless you're going to be playing a game that really hammers your network connection, you'll be fine with an 802.11b network.
Ols was saying a couple of things. First, your cable modem might be slower than a b router. Two, a g card can be used with a b or g network. So if you decide to upgrade your network to 802.11g, you would only have to buy a router.
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