Late to the party, but AMD processors no longer have "front side bus." Most if not all, have the 2ghz hypertransport. Soon, Intel cpu's will no longer have FSB either.
Anyway, good choice on the Compaq. Theyre owned by HP so I dont think they could be that bad of a quality and it does have the faster processor. The only thing is it has 3GB instead of 4GB to utilize dual channel memory. But dual channel memory is kinda moot in AMD processors.
Well have fun witht he new computer. That was a pretty huge jump in terms of processoring power haha.
Some good cheap and free virus and spyware cleaners are:
Virus:
-AVG
-AntiVir
-Avast
Spyware:
-Spybot
-Hijack This
-Adaware
Firewall:
-Comodo
-ZoneAlarm
I personally use a combo of AntiVir, all of the mentioned spyware removers and Comodo. On top of that, I regularly clean my cookies and browsing data with CCCleaner.