Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
No, but you can use an AM3 CPU in an AM3+ board.
Looking at your setup, I don't think you should upgrade to BD either as it will not really offer any more than you already have.
yes you can use a bulldozer in a few am3 socketed boards , i can run them in my 890fx mobo with a bios update