Keep in mind that a hub is different from a switch or a router. Hubs transmit the same data to all the ports (so bad for games), where a switch and a router manage traffic through the specific ports (Ideal for games).
A switch is probably all you really need. You can step it up to a router, because a router is just a switch with the ability to configure where data is "routed" to (theres a LOT more too it, but it's not important). Switches are dirt cheap on newegg.com. Check this one out for 10 bucks and 8 ports, too.
URL: http://www.newegg.com/Product/Product.aspx?Item=N82E16817180002
And yeah, the numbers are transfer speeds. For the sake of LAN parties, you don't need more than 100 Mbits. Also, don't forget Cat5e cables!