morphine is nice. if you take 200mg codeine without much effect, 60mg morphine should be nice for you. tramadol isnt much on it's own, but its handy for potentiating other opiates and withdrawals. and lets face it, if youre planning on fcking with opiates, youre probably gonna end up addicted.
maybe you should give this class of drugs a wide berth, i fucking wish i did.