First off, welcome to the VRCC.
Second, to answer your questions:
1) I put an Avon Cobra on the front of my Interstate, and loved it the whole time I had it running (the bike is no longer operable. It seems they don't like to be submerged in sea water). I put about 4 thousand miles on it. Other folks have put lots more on Cobras, and like them a lot. I say go for it. When my current Valkyrie wears out her tires, I'll put Cobras on.
2) I've heard multiple folks swear by Dyna Beads. Personally, I can't see how they work (seems to me that the beads would be drawn to any minimally out-of-round spot, and not the light spot of the tire, like they're supposed to, but that's just my initial thoughts). Lots of people swear they do. I'm an engineer, and in engineering, data trumps theory, so I guess if the data is trustworthy, go for it.
Just as a matter of our curiousity (read: nosiness), tell us about yourself. I see you're up in Washington. You may be a little disappointed with the rides we plan, as they won't be anywhere near you, I'm afraid. We're all located in Texas. We don't shoot Yankees on sight anymore, so you're welcome to poke around here, but if you're looking for something with a more nationwide flair, check out the national web page/forums located at:
http://www.valkyrieriders.com/and for technical based discussion:
http://www.valkyrieforum.com/forum/vrcc_tech.cgiand for general BSing:
http://www.valkyrieforum.com/forum/main.cgiMark Stovall