There is no point taking any other combo, you will just gimp yourself.
Biochem/Bioanalysis/Diplomacy = This creates reusable med packs, reusable stim packs and implants. This makes it pretty much the single best combo for Tanks as it basically gives you infinite consumables (though they have long cooldowns) and Implants give the best status bonuses for Endurance and Armour Rating.
I had been thinking of going this route myself, but other places I've seen descriptions for doing the Biochem thing have Underworld Trading in place of Diplomacy. Is either one really better/worse than the other? Pro's and Con's of each?
Appreciate the post, as it helps those of us who barely got to dabble in crafting in the beta.