AVG, Avast and AntiVir have been the best free AV options around. Although from what I've heard AntiVir has gotten more toward nagware than freeware lately.
If you'd like to try a commercial AV that's not Norton check out Kaspersky or NOD32. Kaspersky is a little system intensive, but it's to-the-wall for detecting anything and everything.
Could someone kindly show some pictures of AVAST's UI?
I am using AVG7.1, but as you know its free virus update service will be discontinued around two months later!