GLad you found a kit. They may be able to revalve the stock shock also. Although the best benefit of aftermarket is fine tunability and ability to lengthen the shock to change ride height independent of preload.
Your first order of business is to get new springs. Even if you opt not to revalve front or rear, you'd be well advised to start there. A little over $200 and some fork oil, seals and bushings and you're done. Any suspension shop should be able to donthe springs front and rear for you.
I'm glad I worked with my builder. Except for having the tools I think I can do my own forks now.
-2006 CBR1000RR- Jardine RT-1 CF, GP Shift rearsets, GP Suspensions 20mm revalve, Penske 8987 triple clicker (more upgrades in progress)
-2013 CBR250R-ABS (Hers and now SOLD)
-2002 CBR600F4i (Track/Street) (was mine and now hers)
ZG Dbl Bbl, Galfer SS Lines, PC3r, Muzzy s/o, K&N air filter, NRC stator cover, ShiftMinder(WTF?), Fireblade brakes, Gold Rearsets, undercut gears, Factory Pro Shift Kit
Ohlins, Racetech, Showa custom Suspension
Because 12,000 RPM makes me feel better