getting every thing ready for my first grow

ok on the 10th I will be ordering every thing for my first grow and building my grow box. my box will be 3' wide 3' deep and 6' tall intake at bottom right corner out take top right corner. I plan on using drip system in 5 gal buckets with 8" mesh tops pump in each bucket and air stone. I plan on 4 of these 5 gal set ups in there. I was planing on ordering

Digital Greenhouse Ultimate 600 watt HPS & MH Grow Light
CoolTube 6 Reflector + $35.00
HTGSupply 600w HPS Lamp
GrowBright 600w MH Conversion Lamp
No Spare HPS Bulb
No Spare MH Conversion Bulb
No Timer
No Sunrise Hi-Low Hangers
110 volt power cord
Standard Warranty

GrowBright 6" Inline Fan & Charcoal Filter Combo

both from htg

what do you guys & gals think of this set up any flaws or inprovements I should make?
any input at all I will be thankfull for

Also I will be growing skywalker OG

any input at all would be great

no timer? bad idea. they aren't too pricey and are essential

yes there will be timers what I really need some input on the light and fan
I plan on running the carbon filter tooked up before the light and fan at the end pulling through the filter and then the light and out

any advise at all would be great on lighting choice and fan