AVG, and Avast are good anti-virus programs, but not suites. I've also read that Norton has put a focus on speed/performance. Here's a review from PC Mag on NIS2009
http://www.pcmag.com/article2/0,2817,2330024,00.asp
With paid antivirus/firewall software, in the USA, there are often sales/rebates going on so that after you buy one copy of a program, you can get a competitors program later for a lot less, or even an upgrade rebate for sticking with the same vendor. So if the OP does go with NIS2009, he should check what it will cost at a store vs downloading at full price from Norton.