Axiom Home Page Forums General Discussion Technical Questions M60 questions on upgrades and wattage requirements

I've been wanting to move to a three way speaker and I'm thinking about trying the M60s. Can anyone answer the following:

1) What is the advantage of the die-cast woofer baskets upgrade?
2) I don't plan to bi-wire. Is there any reason I should get the bi-wire upgrade? I've never seen a 3-way without a bi-wire input.
3) My amp is 40 watts. I see the minimum wattage required is 10 watts, so I should be fine, but is a 40 watt amp really enough to drive these speakers?

Thanks for any help you can provide.

UPDATE - I got an answer on #1 searching the forum. Also, my setup is for music listening, not home theater.