For your combo I too recommend the RHS heads. I would recommend the use of the 1.94 1.50 valves. Since you want to stay smooth idle, and high low end torque, then there is no need in spending the cash to convert to a roller when a flat tappet will do the job just as well as there really won`t be any power gain by going to a roller when it`s that small. going to the RHS heads alone is going to wake it up like you won`t believe.
This is the cam I`d recommend, it has a smooth idle and excellant torque and street manners: