I rarely multi-class, and i've found that a good group makeup is:
Fighter (Battlemaster)
Rogue (Thief - dual wield, dex based, and make sure to use two hand-crossbows)
Cleric (any - to be honest, they all work just as well as any other if you play to their strengths)
The fourth can be literally anything.
Battlemaster, Thief, and 2 Priests is very powerful (twice the healing potential and twice the spirit guardians stacked atop each other is amazing).
