Re: Kasperski, if I was paying for AV, this would be my first choice. I don't see much reason to do so in the current climate.
Re: AVG, bloatware or not, it used to be the daddy of free AV, but it's got progressively more crap as time's gone on. I used to recommend it, wouldn't touch it with yours these days.
Re: Norton, easy target, it's not as bad a people make out. The corporate version is better than the home one, as the home versions tend to try to do too much and suffer as a result. I've found with Norton (and with a lot of AV to be honest), they prioritise detection and features above performance, so the default settings are so aggressive that they can cause a massive performance problem. The vast, vast majority of complaints I've dealt with regarding Norton can be fixed be setting the damn thing up properly.