the 225lb spring will help make the sled feel lighter in the front..its worth the $$ for sure..get it
if you do much trail and much powder, you will most happy with your limiter straps in the middle hole...make sure your front track shock is also in the upper hole (shock straight up, not layed down) that will help take some weight off the front end as well..
with this stuff, it will take the front load off and prevent the heavy front trenching..
to go with your steering post..
get a set of some HOLZ spindles, or the 08+up OEM polaris spindles..much better geometry and will dramtically help in steering..
also make sure your skis are aligned and you have proper toe-in/out
you may also need to replace/rebuild your front shocks..but that depends on what you have now..
i have the new 09 HOLZ spindles, floats, zbroz a-arms, lower limiter strap hole, 225lb spring...and i can litterally turn on a dime now...LOVE IT!!