I am looking for a lightweight HIPS to add to my list of resident protection. I am concerned about lack of realtime antispyware protection. Currently I own Ewido 4.0 but I found that its resource usage is still a little too high for my taste, so I use it on-demand only. I run NOD32 and have Immunized IE with Spybot and Spywareblaster and generally am careful and use Firefox whenever possible. But I would like an extra layer of protection. So I have determined that DefenseWall, GreenBorder and SandboxIE may be solutions but so far all of them I have tried have various compatibility problems. I will admit I did not yet try DefenseWall 1.60 final version and last time I tried SandboxIE was a while ago, also not the current release. I was wondering if anyone has links to independent HIPS review site or has opinions on comparisons between these 3 programs? I am mostly concerned with reliability with minimal impact on system resources.