4' tall... man, you might want to look into some serious Halides, like 1000 watters. It all depends on what type of tank your aiming for- SPS, LPS, SPS/LPS, FOWLR, etc. - This is just a basic rundown, I can get more specific if you like.
*Big tip* Be weary of the LFS's around here, Most of them are more worried about sales quota's than the actual health of your system. If you have any questions feel free to post them here.
Lighting-
A couple of LumenBright 400w retros from reefspecialty.com might work, but keeping anything other than some LPS/softies down low would be difficult, if not impossible. These reflectors are great at projecting light downward (spotlight) and you don't get alot of spillover. You could skip the Actinics by running 20k bulbs.
Filtration-
Good RO/DI- I'm using a SpectraPure 5 stage maxcap & I swear by them, 0 TDS for over 6 months now. TheFilterguys.com make a good/cheap unit and Melev (Melevsreef.com) is making a nice system now.
Live Rock, Don't buy anything from around here, overpriced garbage if you ask me. Try Marcorocks.com, start hitchhiker & pest free.
get as large of a sump as you can, a fuge full of Chaeto (I'll give ya some), and a big skimmer.. 400g, ReeFlo Orca 250 would probably be perfect, a pro would be even better (Baldor motor & extended neck).
http://www.reefspecialty.com/images/Reeflo250ProSet.jpg[/IMG
*Carbon- Get a nice reactor and keep your water sparkling.
*GFO/Phosban- I dose Vodka, but a decent GFO fluidized reactor is a proven method for controlling phosphate- The Media is a little pricey unless you buy bulk from bulkreefsupply.com (good deals on bulk Carbon Calc/Alk/Mag sup also)
Calc/Alk
Depends on your plans- little more info would be helpful.
Calcium Reactor> I'm running a Schuran- build quality & ease of use are second to none. I run all my top-off through a Kalk reactor as well to keep my ph stable.
Pump/Circulation (need more info on your setup)
Sequence Dart- primary
Couple of Tunze 6201's on a controller? Vortechs maybe??
Controller- (again, need a little more info)
*Automate your whole tank, moniter ph/temp/orp, turn on fans/chiller/heaters, light timer, etc.. *
Neptune Aquacontroller
Profilux
Aquatronica