I tend to take the uber patient, understocked approach, but here is my set-up for a 55 (this is what I actually have)
Mag 7 pump (for closed loop circulation)
whisper 5 filter (just movement and occasional Carbon bags)
2x24" Coralife 2x65 PC
light fixtures (same as suggested above, just two seperate units)
thats all I've got. I don't have a skimmer, but I'm also running a very lightly stocked tank.
The only other piece of equip I have that you WILL need, is an RO
filter. They are a must for SW