Hey Mark,
I'm regretting getting a 430 for my small sails (5.7 and 5.0) now. I would have been better off getting a 400 skinny. My 5.7 (North) is recommended to set on a 400.
Was checking out the Gun and Loft sails, everything's running 400 skinnies now, it's gotten to the point that buying a fat 430 mast is only good for cammed sails. I must say I'm disappointed though, if the Gun and Loft sails are the budget range, then surely they'd be built for a budget mast? Noooooo they want you to shell out craploads of dosh for a skinny.
And that's not to mention companies like Pryde (one extreme) and Gaastra (the other extreme) that decided that they're going to change where the masts flex the most, just so you have to buy that particular brand's mast! If I could shoot the guy who made that decision I would save the bullet and drive bamboo stakes underneath his fingernails, set fire to them, and then whack him in the nuts repeatedly with his non-fkn-standard mast.
Sorry about the rant but I had to vent after doing some research last night