5th?, get a Fox DHX 5.0...
I did. Paid the full $399 (alot less than a 5th, $500+ with eyelets and such). The DHX 5.0 is the best shock I have ever ridden! In my opinion the Pro-Pedal, Boost Valve, and Bottom Out Adjuster are just as effective as a "stable platform" as a 5th element but at alot less cost. So adjustable and plush...there is a reason they come on the Stab Primo, Stinky Supreme, and lots of other badass 2005 bikes.