Hi,
my suggestion would be to not use a repeater, but if your house is wired with coax, to take advantage of MoCA and put another actiontec (usually ~$25 on ebay) in another room that has coax.
This FAQ details how to get an actiontec into another room, »
Verizon FiOS FAQ »
Can I get an ethernet connection in a room with only coax? and also points out how to keep the wireless on, so that it functions as a wireless access point.
I have been extremely successful in doing this at both my home, and at a family vacation home, where the router is in the basement, and an actiontec connected via coax has been deployed upstairs.
And as a plus, if the SSID's and WEP / WPA / WPA2 keys are identical, then the computer will seamlessly roam between access points.
Now, if you are looking for a regular repeater, i have not heard of any reported incompatibilities with the actiontec, but due to the simplicity, and the better performance of the solution i just outlined, it seems to be the one people generally stick to. If you want suggestions for a pure-repeater, I'm sure others will be by soon to offer them, but i figured that this would be a good start.
- Joeiac
Edit:
sounds like repeaters will NOT work with the actiontec or westell