well I haven't had it in a long time, but I always got a nice buzz from 40-50mg, and went up to 80mg or so as far as I can remeber. not enough to really nod out, but if I lied down, it became very smooth and dreamy.
I cannot comment on the combination with temazepam (or any benzo), but you should be aware that combining benzos with opioids can be more respiratory depression inducing than opioids alone. so be very careful and dose low if you want to go this road.