Heavy: Ditch Dalakohs, not even particularly funny as a novelty item. Tomislav/Sandvich/GRU is a fine set-up, although you may get babies whining at you for using it. Swap to Minigun if there are a lot of Sentries or you're on kart pushing duty. The Sandvich/GRU combination is simply too good to give up in 90% of circumstances.
Soldier: Really you shouldn't be relying upon the BB, but if you're pubbing and can't be arsed being or babysitting a Medic it's not bad. Two things about the RS: it mini-crits ANYTHING in the air, not just conc jumpers, and its effect wears off 3 seconds after it is drawn, which not everyone seems to realise. It's good if you can consistently pop people into the air/you're fighting a lot of Scouts, otherwise the shotgun's longevity beats it.
Other options: The Liberty Launcher is good if you're REALLY struggling against Scouts, they really can't do much against it at all. Again though, that 1 less rocket makes you weaker, particularly in the air. Disciplinary Action is good if you're playing with a lot of Medics and Heavies who need whipping along a long CP map.
Demoknight: Lot of options for him, as long as you realise he's a strictly shits and giggles class and you're likely to die a lot against decent opponents using him. What I tend to use is Nades/Screen/Vanilla weapon of choice (SPANG): this leaves you with the all-conquering utility of nades, the ability to charge at point blank and do tons of damage, and gives the +25 health survivability which the Eyelander takes away from you. You might fancy taking the Eyelander instead if you're feeling brave- and the extra melee range is really helpful- but with the reduced shield protection you are very vulnerable. Remember with the Screen, for a split second after you shield bash someone your weapon is still charged- if you combo the two you should kill most things.
A more troll-y load-out is LnL/Targe/Persuader, which allows you to one-shit shit really easily and gives a hilarious amount of survivability. The Persuader was designed not to be usable with any explosive weapons, but as l
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