Steve, here is my suggestion:
Before you buy any livestock or equipment decide what kind of fish you most like. Your fish preferences will dictate your tank size.
Do you like fish that require lots of space?
Do you like fish that group around reefs and simply need hiding places?
Do you like fish that grow beyond 4 inches?
Secondly, decide how much space in your home you can assign to your tank, without going insane in buying a 300 gallon tank, if you have the space and you like fish that grow past 4 inches then get the 90 gallon, if you can check out the 120 or 150 gallon tanks that are the same with as most 90 gallons, 4 feet wide.
If you intend on buying your tank brand new check out Maximum Reef Aquatics in Yonkers they have the absolute best prices OR you can obtain quotes and ask any vendors of your choice to give you their best pricing, sort of bidding for your business. If you have patience you can buy used here on the forum, internet, craigslist or Ebay.
As for equipment, you do not need a $900 skimmer but try to buy a decent skimmer so that you dont find yourself like some of us that end up buying skimmer after skimmer bc we just enjoy charging up our credit cards. You should not be spending more than $300 on a skimmer for a simply fish tank with a handful of fish and easy to keep corals. Check out the SC302 skimmer by SC Aquariums.
As far as lighting goes if you solely intend on keeping easy to keep photsynthetic corals you dont need more than what you said T5 HO or maybe some VHO's but you dont even need VHO, T5 is fine. You also dont need any expensive T5 fixture, you just need the right bulb spectrum and decent light unit and the corals do the rest on their own.
I forgot to mention, go with a reef ready tank and a sump, overflow boxes are a pain.
You do not need to spend big bucks on "live sand" just buy dry aragonite sand.
you do not need to spend $9 per pound on live rock, Maximum Reef Aquatics sales it on the cheap.
You do not need a calcium reactor, just get yourself on a steady maintenance schedule.
You do not need expensive
vortech pumps, hydor is fine for your application.
Keep it simple, reasonable and manageble, if you find yourself still having a tank 2 or 3 years after you set it up and become bored then you can start charging up expensive skimmers, expensive pumps, digital controllers and fancy lights.