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try set the wifi AP only for "N" standard (not B,G). if you can join the network, it is OK...

or

watch the speed of file transfers. N is faster, it should be 300MBps vs 54Mbit for G standard
 
But for Internet speeds, b is just as fast as g or n, correct?

If you have 100 Mbit/s internet then its not :D. The theoretical speeds of b are up to 11 Mbit/s (expect 8 to 10), g is up to 54 and n is up to 300 or 400, however you need multiple antennas to get that kind of speed.

Overall, if you want to move huge amounts of data over your wireless network, get wireless n, and if you have internet from let's say 30 Mbit/s and over I'd get n as well.

But if you have the usual internet speeds like 10 Mbit/s then you're fine with b/g.
 
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