You don't need an a/b/g router to use your card. The card has the ABILITY to use a Wireless a, Wireless b, or Wireless g router. You do not need to have a router that also has the ability to use all three. Pick one of the letters.
Wireless A - FAST. 54Mbps (I believe). Short range (100ft -ish?). Expensive. Hardly used anymore.
Wireless B - Slower. 11Mbps. Longer range (300ft -ish). Less costly. VERY common.
Wireless G - Best of both worlds. Fast. 54Mbps. Long range (300ft -ish). A little more expensive than Wireless B. Getting more and more common.
A Wireless G router is also backwards compatible with Wireless B routers (a little more incentive for the G).
The Wireless Super G you've seen (108Mbps) is ONLY if the router and the network card are the same brand as said above.
If this router is only used for the internet, 11Mbps is plenty fast (it translates into about 1,300KB per second download/upload speeds (I've never seen a DSL, Cable modem, or satellite go this fast). If you plan on linking several computer together and sharing things across them, you might want to go for the Wireless G with up to 6,750KB per second.
The numbers used on routers and network cards are NOT the same as the upload/download rates you see when transferring a file (say downloading a picture or music file or installation file). Routers and network cards use MegaBITS. 54 Megabits, 11 Megabits, 108 Megabits. When transferring files, the numbers used are MegaBYTES. Different by a multiple of 8. 8 MegaBITs = 1 MegaBYTE These numbers are deceiving. So 54 Megabits = 6.75 Megabytes, 11 Megabits = 1.375 Megabytes, etc. Also, 1 megabyte = 1,000 kilobytes (KB) and 1 megabit = 1,000 kilobits (Kb).
Hope this helps out.