Front springs Hyperpro or K Tech

[PieEater]

but as you attack corners they compress more to a firmer spring rate

I was always lead to believe that you shouldn't corner on the brakes because when the forks compress the steering geometry is changed making it trickier to get round corners, this seems to be evidenced on the odd occasion I have had to brake mid corner and the bike has stood up. This is why I would be more biased towards linear springs, I wouldn't really want my forks compressing and the bike changing steering geometry with the slightest hint of brake or bump, which would seem more of an issue with progressive springs.