MegaBytes per second or Megabits? Uppercase B should mean bytes, lowercase b should mean bits. Network speeds are commonly measured in bits, file transfers are commonly measured in bytes.
In my experience, 2.5 MBps (bytes) would be good for G WiFi. N WiFi should be several times faster.
If you have an N router, you should be able to upgrade the 10v's G WiFi card to an N one for $25 or less. The Intel 6200 or 6300 may be the best choice for a 10v with Windows or Linux. But I don't think the Intel cards will work in OSX, so you'll need to ask someone else for advice.