Tent/Room
Lights
Ducting
Thermometer/Hydrometer
PPM meter/ PH meter
Nutes (Not basic a+b) Nutes Macro/micro
Something to deal with bugs
Something to deal with root slime
Buckets/Totes/Etc
Extra reservoirs
Net pots
Carbon Filter / Extra Carbon filter replacement
Duct tape lol
Circulation Fans
Inline Fans
Ph up/down
If doing DWC, enough air pumps to pump enough air...
Extra airstones
What are you doing for water? Tap? RO? Filtered Tap?
A good camera to take macro shots of your lovely ladies!!! ~$200
Possible compact AC for temp control ~$500
Gloves to use when dealing with chemicals and cleanup
Grow medium Perilite/Hydroton recommended
Something to use for clones: Lets say basic
Root Horomone
Warming pad
CFLs
Rock wool
Where are you going to put all this stuff!? Going to need to buy/build shelves or a locker of some sort.
Extension cords
Surge Protectors
Timers
MOST OF ALL - Clones/Seeds
Buy all this and still have ~$2,000-$3,000 left over to get what ever else comes along. DON'T BUY THE CLOSET!!!
The stuff is so easy to put together... You don't need someone else to do it for you. Shipping will be lower most likely too...
You will feel better putting it together yourself.