It sounds like Avant is a sweet browser, but I do want to ask if you have run spyware/virus scans since installing it, and if it seems to perform as well at keeping the nasties out as Firefox.
I will be downloading it later today, but I am a bit leery since it is still built on IE, meaning it may have the same security holes despite the popup blocking.
I have run AdAware and Spybot, though it's been awhile. I have regular virus protection. But I work in IT, and can say confidently I don't have any spyware behavior -- slowness, unexplained popups, etc.
Dan
One thing good (or bad) about Avant is that it will not let you add but a couple of toolbars. google and roboform. A lot of malware uses the toolbar feature so to me this is a good thing.