Just a comment from me as ya already have a plan yet I like the free defense in depth plan that includes but is not limited too:
AVG
Ad Aware
Zone Alarm
Spybot
Spywareblaster
CCleaner
All available with free daily or weekly updates.
All that run along with windows defender and windows malicious spy-ware removal tool from M$ has kept my little systems free and clean from malware.
Free is good.......I feel that companies that make ya pay for your security tend to present false positives per se to make you ....continue to pay !
Stay safe ......:o)
So can I replace my SpySweeper with SpyBot?