Ordering Fork Spring Question

I am want to order fork spring for my 2003 CRF 450. The MX-Tech web site suggested .489 spring, I was wondering how much difference I would feel going from a .47 to a .48/.50. In looking at the fork springs that you carry it looks like I need to order either the .48 or the .50 spring. which one to order? is the .48 going to be to soft or the .50 to stiff?

Your recommended fork spring rate is....0.4898kg/mm
Your fork spring series is....43495xx

Thanks for your time,

GTRider