I doubt you'll find one and if you do you are going to pay a premium price.
I can't see any problem with an ISP's FUP. It is there to bennefit all. What it does is to try an give an even flow to ALL it's customers at ALL times. When the internet is quite you can download to your hearts content, I download overnight and can do 3 to 5Gb a night. When the inetrnet is busy, say 5pm to midnight I browse if I use the net. This lets every one get there fair share.
It's people who download vast ammounts at peak times that spoil it for others on a tight broadband line. It can drop the speed of other users down to old dial up speed in some cases.:(