Most laptops come standard with 802.11g built in and all come with 10/100 ethernet ports built in as well. Assuming that by "cable modem thingy" you meant "ethernet card" you will be fine. I don't know if there are any laptops that have an on-board cable modem, but you wouldn't want one anyway. What you need simply is a wireless routher and a laptop with integrated wireless 802.11g connectivity. Then you will be golden. You can look at onboard bluetooth connectivity as well. My new dell laptop is pretty decent. No complaints.
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