Best antivirus?
Price isn't an issue
Why buy one when there are free ones that are just as good?
I use Avast! antivirus.
I'm using Kaspersky. Its pretty good.
I wouldn't bother with any Antivirus to be honest. I mean how many times has your old antivirus picked anything up? They just slow your PC down on boot and during normal tasks. Just don't go on any dodgy looking websites, dont read any stupid emails that are obviously going to be a worm, update Windows and you will be fine. If you ever want to do a virus scan then go to trend micros website and do a free web based one.