250-300? Good light cost about that much. Also hydro you have to buy nutes along with the above mentioned. Exhaust sounds good just be sure to get an inline fan strong enough to cool the 600 and the box at the same time..If you putting a carbon filter add an even stronger fan. 225 cfm may do the trick. May be wrong so dont quote me. Good 600 watt:200-300 maybe find a better deal on the internet. Good fan 100-150 again depends on area and maybe able to find a good deal on internet. mischalleneous:100-200dollars total estimated cost- 400 with some great bargaining skills $650.00 on average