Donny:

Check out this review from PC World. Bit Defender is compared with Norton and 3 other products:
http://pcworld.com/article/124475-1/article.html

Personally I use NOD32 from http://www.eset.com as my antivirus program. There's not a lot of overhead to the product, so it doesn't slow down system performance like many security suites have a tendency to do.