The panhard bar is certainly a good idea. The only way to control lateral movement with out bind is the addition of a lateral arm.
A good set of lowers is the place to start... then you can always go for a griggs torque arm, or some parallel uppers later (with proper springs).
www.wmsracing.com has some killer looking race arms. I think they'd be the best. You get weight jacking, 3 positons for the stock sway bar (which is similar to changing it's thickness), a spherical bearing on the proper end... At $336.60 US, they're not cheap. If you could get them to drop the anti-squat brackets, and the price, it'd be even better!
HTTP://www.wmsracing.com/pgi-Product%20Spec?WMS-RLA79M