Don't waste your money until you know what type of interference you are getting. For all we know, your living room could be filled with 10000000000000 AP or nearby creating a lot of noises. Find a wireless scanner and figure out what channels each AP are using and avoid those channels. In addition, your home walls, materials of the walls, etc... can be interfering also. And AP aren't the only source operating in the 2.5 or 5GHz freq.
Reminds me of the old days. Everyone has the 900MHz cordless phones and then your signal sucks. They all move to 2.4GHz. Then everyone moves and it sucks. Then 5GHz and soon everyone goes there too. Now that everyone is on 2 or 5GHz, put back your 900 and you have less interference.
Personally, I always find better interop when using the same wifi chipset in both my router and laptop; usually Atheros or Broadcom.