Bear in mind that you'll be lowering your bottom bracket, as well the front end. This could lead to pedal strikes, especially off road!
A 450mm fork I've used before is the orange F8 disc.
It's quite light for a steel mtb fork. I also found it quite comfortable. It doesn't have lowrider mounts, but it has got mudguard eyes. It would limit your choice of rack but something out there should fit.
Bear in mind that you'll be lowering your bottom bracket, as well the front end. This could lead to pedal strikes, especially off road!
A 450mm fork I've used before is the orange F8 disc.
It's quite light for a steel mtb fork. I also found it quite comfortable. It doesn't have lowrider mounts, but it has got mudguard eyes. It would limit your choice of rack but something out there should fit.