"kiss" or "witness" marks are VERY common even with the std cams, but so slight they don't bend valves, personally I'd go Mahle, they were oe fit, and oe stuff tends to be very good generally.
The reference to the offset wrist pin, is misleading all 2wd pistons were offset as well, just not as much, currently supplied pistons will all have the same offset as 4wd, very good price from Matt Lewis, 01922 692424.
tabetha