I've been studying and doing experiments with anti virus software for a long time and I can assure you Kaspersky is not number 1. When I tested the 2013 version it had very poor detection rates but had decent real time protection. (It let a lot slip through) Also prepare yourself since the scans will take a long time but at leas they have an option to change 'scan only new files' It also has an annoying bug where it forgets that you are registered. I never tested it but I have read Webroot is overrated with poor results. Trend-Micro is good but I noticed it has a lot of false positives.
I have used Bitdefender 2013 on my main computer and was happy with it. My only complaint was that no matter what computer you have low to high end it will impact your boot time. Other than that I was actually impressed with Bitdefender. There is also a video online where someone tested BD, Kaspersky, and Norton. BD came out first, Kaspersky 2nd, and Norton 3rd.
On my main rig now I use ESET which IMO with my experiences is the best AV on the market. Was once used by Microsoft Corporation themselves. I am really impressed by its strong protection and detection rates. I am confused to why websites give it low scores compared to the others I've mentioned. Professional IT I know don't trust another suite compared to Nod32.
Anyways as long as your not visiting some dangerous really out there sites, than Kaspersky should be a fine choice.