CRKT Ripple, its small and light but still has a decent blade length. It is also a flipper but it isnt spring assisted but the blade will open with a finger flick only and does not require any wrist action. it uses a ball bearing system to reduce friction. its a great "gentleman's folder"
they make a couple stainless handle versions with a frame lock or an aluminium handle version with a liner lock.
the aluminium version (which is the one i have) comes in two sizes
3.125" blade 2.5ounces & a smaller version with a 2.7" blade that weighs 1.8 ounces.
both sizes have a 8CR14MoV blade.
the stainless versions use a Acuto 440 steel in the blade and weigh about 3 ounces
out of all my knives the CRKT ripple and the CRKT shenanigan are my favorite. if you want something larger then the ripple the shenanigan is amazing, i got a brand new one off ebay for $16 shipped! it is also a flipper that isnt spring assisted but it also opens very smoothly without any wrist action (which is important to me) it comes in a aluminum and synthetic handle. the blade is AUS8
out of the two i like the shenanigan more due to its larger size but i think the ripple will fit your needs better, but both can be bought for less then $50