There is a lot of information at
TheBackShed.com - Homegrown Power
Go to the forums and have a read.
I agree with Bryan1 as we both have been around wind energy for some time and a vawt is expensive for the return it will give.
If you intend to spend money on magnets then you will want the best return in energy for the dollars spent.
My magnets costed $400.00 and for that outlay in dollars i want to produce as much power as i can.
The better the magnets the greater the return in power, if you intend to use some cheap crap magnet you will get a low power crap result in return.
Many of us have played with wind energy for a long time and it always amazes me how the new boys on the block think they can do what the rest of us in the know, point out will not work worth crap.
The funny thing is they always disappear and never post their results, which proves to me what we tried to tell them they found out the hard way, after much cost and poor results.
The advice is build it to a proven design and work forward from there as it is hard enough to extract energy form the wind without starting with a loosing design to begin with, as a vawt is.
The simple fact is if they worked well enough you would see commercial vawt mills and you dont only kinetic art.
Pete.