About standard loadouts, I think it is pretty simple. Bolters and falchions.
Special weapons are pretty much garbage right now, as you take a -1 penalty to hit even on terminators, and they are ridiculously expensive. On the other hand, Storm bolters have been hugely buffed, they fire twice as much and are a lot better at wounding ( they wound rhinos and dreads on 5+ instead of being impossible, for example). A psycannon is barely superior to a storm bolter, in fact, 2 storm bolters deal most damage than a special weapon in every single situation.
As for nemesis weapons, falchions are the right choice in every infantry model. For power armor and regular terminators they are better in every situation. For paladins, halberds are slightly superior vs T5 and considerably superior vs T8 (but they are both garbage vs T8) and falchions are better agains everything else, and A LOT better vs T3. So, all in all, falchions are the right choice.
I will include a hammer in every paladin squad, as the paragon is very good with it, and I think I would include one also in every terminator squad (but there's no reason to take terminators over paladins ).
BTW, dreadnoughts are amazing, they are the best way to have good heavy weapons in our army. Of the venerable kind and with a laser and autocannon (or two autocannons) they deal with problematic heavy units. Mine are allies from the Silvery Holy Guys chapter, as I am not paying 20 points for a smite I'll never use.
As for the correct loadout for Dreadknights, just don't take dreadknights, they are awful.
Edited by Seizeman, 02 June 2017 - 12:15 PM.