AVG is being heavily marketed as version 8.0 now, although the free 7.5 is available - either way it's a good deal.
I'm using Zone Alarm Security Suite, that does the lot - got 2 years for about £25... anti virus, firewall, anti-spyware and mail filter, and not that's sat behind a router that is 'firewalled'..
Our laptop, and anyone else - I use AVG Free - it's been really good.. just takes a bit of searching to get the free one, now they have the new version out..... don't forget it's updated regular.
Zonealarm also offer a free firewall - it's good if it's a stand alone PC, and you don't use it as a 'gateway' for other PC's on the network (i.e. if you don't have a router). If you have a router, then it's fine.