Hi and thanks to you both for your information.
I did a little investigation on the network adapter that I have now. It is an Atheros AR9285. Here are the supported data rates.
Supported Data Rates
IEEE 802.11b - 1 to 11 Mbps
IEEE 802.11g - 6 to 54 Mbps
IEEE 1-stream 802.11n - 6.5 to 150 Mbps
The Intel 6230 not only goes to 300 Mbps, it is also dual band.
As for the AC routers being a waste of money, this one sure seems to be doing a good job right now.