I'd seriously think about skipping the cool tubes, at least for now. You've got the cubic footage to handle 2k easy, and air-cooling your lights requires a whole secondary ventilation system, including a pricey seperate blower.You should be able to cool that room in open reflectors ( HydroFarm Pro Ultralight, Sunlight Vertizontal) with a single blower in the 500+ cfm range. Run ya $225 ish. A pair of smaller blowers would be more around $350. Spend the differance on a temp/humistat.

Pair of Ks w/horts- walk into local shop w/ cash and list. You should be able to get one full price, one at cost- about $700,750 depending on the line.

Classic 3000s should be about a buck each, a bale of ProMix around $20, gallon of PbP-$35

Black and white poly for walls,ciel,floor- $50 ish

Comes in just shy of $1100, but you'd be solidly set up.