I think without a doubt, you best bet would be to run a hell boss of your choice, then trade for it. Running for a specific item will likely be a sure road to frustration. (Mind you, it may have worked for some of you)
Running Hell Meph, Pindle, or even Andy, can produce great items, and you can run them much faster than Baal, even on NM. Plus, you can exploit the Andy bug in Hell for consistently big drops.