Setting up new grow room need answers

OK I am in the process of buliding/ setting up my grow room. I have a couple questions about strains, lights, venting and things like that. I am making a grow closet/box, it will be 6'6''tall x 3'6''wide x 5'6''long. I plan to use 2 400watt HPS (using conversion MH bulbs in veg). I will be using 5 gallon buckets and fox farm soil with bat guana and worm castings also fox farm nutes. I plan on using a 5 computer fans with CFM of 110 per fan, fans will be hooked up to ventation tubes going outside. i did the math and my space would need a cfm of 500 so they should do. I will also have an intake. Now thats my basic setup. I was wondering about the lighting, Is 2 400watts to much for that space or should i have more? I plan to have about 10 plants. Do you think the fans would work if i mounted them together or should i get a cheap blower? My last question is about what strain to use, My basic things i am looking for in a strain is Potency,yeild and size. i am looking for a really potent strain, like on pair with white widow, i looked up strain the other day and people were talking about white rhino and og kush and strains like that. I was wondering what is a good strong, high THC strain. Also what seedbanks have you ordered from and how good were they? any info is helpful!

one thing you may want to look into is lumens per sq foot: 3500-5000 is optimal.

I built a grow room almost identical size. You can check it out here.

I'm pretty happy with the 400's. They give good coverage.

PC :thumbsup:

I think the comp fans will work, I am also going to make a carbon filter for it. I have been looking for a good strain and i think i have found it, Mazar. I am ordering them from Rhino seeds (Cannabis Seeds). This is a link straight to the seeds ( Mazar ). They are feminized I also like they high THC level. I am wondering about height, I have room for about ten 5-6 foot plants and don't want to waste space. Does any body know of a better strain: tall, high THC levels (like mazar or white widow levels), and good yeilds?