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As for the connection issue, wired is certainly much cheaper than wireless. You've already got the router, but wireless PCI cards are still pretty expensive-ethernet cable is not...usually.
The trick is whether or not you're buying ready-made cables or whether you're making your own. You're going to pay a significant markup on cable in most places, but this is the same as with any A/V cable out there. For example, I bought a box of 1000 ft of cable for $65 two years ago, split it three ways with friends, and still have about half of my share left. Ends are reasonably cheap, and the crimping tool set me back 40 bucks. Therefore, for the price of one wireless NIC, I've wired five or six machines.
Only other piece of advice I can give you is to test the cable BEFORE you wire everything into the walls, and to stay away from electrical plugs etc (I've found that they can cause too much intereference on the network wires). Also, surface or in-wall mounted jacks are really nice to have, and make for an easier connection.
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