[quote name='alfonsosoriano']Now, does being on a mac make any difference at all as to if a router would work, or is it all the same unless specified?
Also, how does the wireless one set up?[/quote]
No, you could have a Mac, a Windows PC, an a Linux PC all hooked up off the same router if you wanted to.
A wireless router will benefit you if you don't want ethernet cable run to all the devices you're going to have hooked up off the router. However, they also make most wireless routers with a 4 or 5 port switch so you can take advantage of wireless if you want to, and have your main computer hard-wired with an ethernet cable to the router, and if the Xbox is in another room or another floor you can buy a wireless switch for that to communiate with your router.
If you ever decide to get a laptop you can be connected the network with a wireless card (or most laptops you buy now have built in wireless), so you're not tethered to the router with an ethernet cable. Also, if you ever plan to get a Nintendo DS or a Sony PSP a wireless router is all you need to get online with that.
Personally, I can't imagine buying a router and not going with one that is wireless, it really isn't much more at all.