30Mbit internet wireless

802.11g should be able to give near those speeds. That would support the widest array of wireless devices. If you are going to buy both a router and a card to go with it you may consider one of the new "features" on most wireless routers now such as SpeedBooster, SuperG, MIMO, etc. Those only work if both the router and client wireless card are from the same manufacturer and support the same things.

For rediculous wireless speed give 802.11n a try. Because it is in sort of a beta phase right now getting a good router and wireless card can be very hit or miss. I myself have had 0 luck with 802.11n equipment but I have only delt with Netgear's versions so far. You may have better luck with a Linksys. For the short time it did work (about 1 minute) I got over 10Mbps from a Netgear PreN router to a Netgear PreN PCMCIA card. That is more than enough for your 30MB internet connection.

Check out Toms Router Charts:
http://www.tomsnetworking.com/lans [...] ?chart=119
See which router that gets over 30MB WAN to LAN is avaliable at a local store. It is better to buy stuff like this locally so it is easy to return and try another

You're almost definitely not going to get anywhere near that on any type of ratified wireless standard. That Pre-N stuff I can't speak for.

But I will say that trying to find a router at your local megamart that reliably supports 30mbps of throughput will be difficult.. You probably need to be looking at business class routers, and definitely want to be looking at running a cable. 54g just isn't there yet in terms of a constant 30mbps.