There are good inexpensive options for lights that are T5, MH and even led, assuming $200 isn't crushing the bank account? Personally I'd spend a bit more up front and get a couple of $100 to $200 led fixtures like MarsAqua or OceanRevive and reduce your long term cost of buying new bulbs every year.
You can buy an expensive sump that is already made, like the one you mentioned. But you can save a small bank account if you go to the $1/gallon pet store sale and get the biggest tank that will fit in your stand, then add the baffles you need by siliconing in cut glass. It isn't hard. Any store, like Ace Hardware, will cut glass to size for you.
A reactor can do several jobs, but for starting out, they are NOT a requirement. I have one in my system as a precaution. It's plumbed in, but I don't run GFO, or carbon or any phosphate removal unless I need it, and I have never needed it (in 12 years!).
ATO is a nice convenience, and it can make your skimmer run more stable, but again, it's not required. I have one, but it's still not plumbed into the system. I top off 2 systems manually every day. It keeps me in touch with that is going on in my system.
I though you were trying to hold on to some of your bank account? MP40's are nice, but IMHO, unless you are going top of the line all the time with a big budget, they are crazy overpriced. Current has a new line of controlled wavemakers that even come with a remote. I saw them at a friend's store and I think they look really good. And they are way less expensive than MP40. And of course there are the Jebao pumps which were marginal when they first came out, but several generations later they are very good quality and very controllable.
Fish and corals and their placement is very individual. If you ask 10 people that question you'll get 12 to 15 different answers!
Be very careful here. Don't go buying expensive clowns right off at the start. Your system needs to cycle which can take a week or a month depending on how you do it. And even then, you WILL have diatom blooms, algae blooms and maybe even a bacteria (cyano) bloom over the first 6 to 12 months. If you rush into this, you will kill things and waste money. NOTHING good happens quickly in a marine aquarium! And no, clowns do not need a host anemone anymore than you need an aquarium. It may be nice to have (if you care for it) but it's not necessary.
CUC is another individual choice. At the start too many people buy too much CUC and many/most/all of them end up dying. Start out slow and don't rush things. I know it's hard, I was there once and I did things I knew were risky and trust me, listen to that little voice in the back of your head that says, "you shouldn't be doing this... yet." I lost lots of fish, corals and other inverts. If you have the finances and don't care about killing critters, you'll be fine (I won't like you, but you can do it). On the other hand, if you want a sustainable and durable reef, it can be done on a budget and with minimal loss of livestock. Just take your time.
You are doing research and that's really a good thing. Read as much as you can and ask lots of questions. That's why some of us are here... to try and help. Read the stickies at the top of this forum (you probably already have).
This can be a VERY confusing hobby because there are so many paths to success, and 10 times more to utter failure. And sometimes starting down one path will not allow you to do some other thing you might like to try. It can be aggravating. If your area has a local club, join it today and get involved! Seeing other people's tanks is a great way to see how things get done and a source for new and different ideas.There is a listing for local clubs here at RC:
http://www.reefcentral.com/forums/forumdisplay.php?f=536
There are 2 in northern Ohio.
Best of luck and I invite you to ask questions all you want.
