I'm going a similar grow but instead of a PC grow box I'm going with one from
here.
It's cheaper and bigger than most of the PC boxes. I'm not spamming or anything, I just searched around and found this one to be the cheapest (although it doesn't have all the extras and you could build your own for much less money)...anyway...
I went with ak-47 x Lowryder 2 aka "easy ryder". NYCSD x lowryder 2 "diesel ryder". They're both autoflowers and I've seen quite successful grows using these strains with similar setups. Basically you want an autoflowering strain. Easy ryder has one of the better yeilds for autoflowers and diesel ryder has some great smoke. For more info on autoflowers check out
this thread...read the whole thing for everything you need to know. Oh yeah, and there is a new autoflower called purple gem ryder which looks quite tasty too.
As far as seeds, google is your friend...or the banners on this site. Just read a few threads and you'll find at least a half dozen reputable seed dealers. Just do your homework and you'll find everything you need in the autoflower thread. as well as links to successful similar grows with pics. Find someone who has a grow similar to what you want and follow their journal and if all goes well you'll end up with a similar final product.