Firewall:- Sygate Personal Firewall , Zone Alarm , Outpost [Also gr8 havent tried it]
AV:- NOD32 2.7.0
Spyware Scanner:- Webroots spysweeper + spybot + adaware se personal [Use all 3]
Disk Imaging :- Acronis True Image 10 , Norton Ghost
PC Benching :- SiSoft Sandra & Everest Ultimate for Temp Monitoring & Benching.
Hope that answers all ur qtns