8.1mm 264 HKS cam's are pretty mild, yet with increased compression respond well with quads and (esp.)aftermarket ecu etc.
Set cam timing as per the HKS cam card which comes with them, else search Oldschooltoy on club4ag as he has uploaded them previously.
I wouldn't personally go with any less than 264, its just too little an "upgrade" from stock. Really only benefit coming from increase in lift.
FYI, i am running 264, 256 8.1mm HKS in my daily and its very driveable, with a noticeable torque increase, but probably too conservative for my liking.
>8.3mm lift it is suggested to go under-bucket shims, but else, if you choose cams below this lift, just upgrade the valve springs to toda's, HKS or TRD's when you put the cams in.