You won't get unlimited download anywhere, all the ISP's are doing traffic shaping and if you buy an "unlimited" plan they definately will be fucking around with your speeds at peak hours and threaten to cut you off if you hammer it too hard.
It's probably more economical, depending on how much you're downloading per month, to get a limited plan for cheaper and just make sure you don't go over the usage limit.
Don't worry anyway, this is what it's going to be like in the near future :
