One big factor is missing. What is the wireless router (or AP)? Is it g or b? Wireless cards cant do anything without the router being capable of it.
BTW, the actual max throughput on a b connection is more like 6mbit. The actual max throughput on a g connection is more like 25-35mbit. Either of these is enough for 99% of all DSL/cable internet connections. Especially considering that 99% of all dsl modems (and I think cable too) have the 10mbit network technology inside.
So either of these restrictions shouldn't hurt internet or gaming in any way.
Now if you are doing file transfers the extra speed of the g can be really helpful. But if you are doing many gigs a day, you should probaby use wired 100mbit (I dunno if gigabit is practical with laptops) connections anyway.