Welcome Matt!
Sounds like your completed your cycling process, Lighting looks good and you seem to have some PATIENCE which will come in handy for sure! So good going so far!
As you might have figured out so far, which way you go, the choices are numerous and none of them will be right or wrong, just different. Whether you go SPS (Not recommended for a Noob, but doable!) or anything else, here are a few suggestions.
First, I know you said your more interested in corals, but a couple of good maintenance species to keep algae, critters, etc in check for your 120g setup.
Cleaners:
Depending on the depth of your sandbed, 10-30 Nassarius Snails for starters, constantly turning over gravel/sand bed.
10-20 Dwarf Hermit Crabs, (IMO in this order #1 Red Tipped Legs, Red Legs and Blue Legs)
1 Sallie Lightfoot Crab
1-3 Blue Neon Striped Hermit Crabs
3 Chestnut Snails, love the color and their great on the glass
10-20 Cerith Snails
5-10 Margarita Snails
1 Court Jester or Randfordi Goby, constantly cleaning sand and beautiful fish
1-2 Tangs, alot of choices here for picking at algae, but Yellow or Powder Blue/Brown are very popular
This should take care of basic maintenance and give your tank some "movement"
Corals, choices are endless, but...
Mushrooms: remember, they can spread quickly in your tank!
Zooanthids "Zoos" Numerous colors, so according to your "PLAN", choose a type/color that your working for?
LPS: Ricordias, Frogspawn, Plates, Acans, etc. Candy Canes fall in this category, but seem for some, hardy to keep going!
Leathers: Devil Hand, Sarcophytons, Sinularia's (Yellow, Green, Pulsing, etc) Can help you with these when your ready? Xenias and Capenellas are two popular items, but can quickly take over your tank if not careful!
Wish you luck, but remember to keep it simple and have fun!!
Howard