Charlie Drissel and 3 Gun Stuff makes some good ones.
http://shop.theshooterssource.com/3-Gun-Stuff-Scope-Lever-Burris-TAC30-3GSSLTAC30.htm
http://www.brianenos.com/forums/index.php?showforum=194
Please tell them I sent you. They both sent me some levers for testing so I owe them a few adda boys.
The 3 gun stuff levers are probably the easiest to install and work well since its a one screw hinged design. The Drissel levers install fine but their strong suite is they have the best fit and finish.
I have one MGM Switchbiew and it's nice but it was built for a different scope than what I was told it will work on. It works but the lever is on the wrong side.