Recommended firewall software

[efx2001]

I have free avast install on win7 at the moment and was wondering if somebody could please give me any suggestions on a firewall software that doesn't use up to much resources. Please help if you can. Thanks

 

[Emerald]

http://www.pcmag.com/article2/0,2817,2422144,00.asp

 

[efx2001]

Thank you for info. Very helpful