You are going to need two different oils for the job.
I've used Bel Ray HVI 3wt and Spectro Ultra Light SPL in WP, Ohlins and KYB shocks with good success.
There are plenty of fork oils listed on this page:
http://www.gasgasrider.org/html/susp-oil.htm
Pick a fork oil with something around 20 to 30 cSt @ 40C viscosity and you'll be fine. If you get out in cold weather get one with a low pour point - your wrists will thank you for it.