What kind of riding do you do? How much do you weigh? Budget?
Off the top of my head, Salsa Semis will handle just about everything within reason you can throw at them, as will Stans Flows. Can't go wrong with either but they might be overkill. The stiffer "equivalent" to what you already have is the Stans Arch.
On a budget, the WTB Laserdisc Trail and Laserdisc FR are solid rims.