Outpost is good, online armor is great with good hips and very easy to use, privatefirewall is also good with hips and probably the lightest firewall there is but to be honest with avast and MBAM running in realtime i would just stick with the windows firewall which in windows 7 is very good plus you have winpatrol to monitor your hips.
A good thing to do is disable remote assistance, control panel/system, click remote setting's on the left and then untick allow remote assistance.