just go to bghydro.com(best customer service on the planet) and buy your lights...you can even by raw ballasts and build your own for 1/2 the price...I spent 210 bucks on 1000w hps hortilux and ballast assembly...bought one of their ballasts box and wired it...got about 250 in the one light itself...custom built by me!
Although you can grow nice plants with small lights...It takes alot of light and a very expensive exhaust system to keep the temps/humidity, down and there is no accounting how yield potential will be less than optimum due to pests/disease/You!/temps/humidity/mold...a ton of things...

you can grow alot of pot in 3 years, but I don't believe you can grow enough for Years to come, unless you use a bigger space , create a perpetual grow, and Trust me on this one...spend tons of cash.

I am not trying to discourage you, but you have 'Big Goals" and I feel you shouldn't be led down a Primrose path...

goodluck, Let us know what you decide. peace