Internet security

I searched the past topic and couldn't really find anything specific on this, so here it goes ...

I've used Norton's on my computer for firewall and such. It is about to expire, and I was wondering what some of you guys use to protect your computer.

I wanted to get something good, and I don't mind spending the money (I would like to keep it under $100). If you could suggest some of the programs you use to give me a little peace of mind, it would be greatly appreciated.

Thanks in advance.