Final decision and my grow room is complete!

I am almost done after a lot of research and great help on here, I just need my hydro system.

I got the seeds coming: Bubblelicious feminized and Northern lights feminized auto flower

Tent and lights: 400W air cooled with a 4"inline and filter in a 2x4x5 tent, so I am stoked to get started. Last I need some advice on the hydroponic system. Now I understand that its mostly personal preference but if I could just get some opinions that would be great. I will be buying one of these from ebay. All different prices and thats why I don't know which one would be more efficient for a noob.

http://www.ebay.com/itm/Hydroponic-Grow-System-DWC-Drip-Combo-Complete-setup-/160565454171?pt=LH_DefaultDomain_0&var=&hash=item6b1b59bfd4

http://www.ebay.com/itm/HYDROPONICS-SYSTEM-BUCKET-GARDEN-AEROPONIC-DRIP-BUBBLER-/110733546449?pt=LH_DefaultDomain_0&hash=item19c83bd3d1

http://www.ebay.com/itm/Super-6-Plant-Hydroponic-Drip-system-6-Netpots-18-gal-/360343481187?pt=LH_DefaultDomain_0&hash=item53e6252b63

They all have different prices and I'm not to concerned with that part I just don't want to get a crappy unit so I'll let ya'll decide

Hey man I would go with the 2nd one.. Most expensive but looks most durable. also in your price range.. check this out, its 200 bucks but works amazing. checkout Stealthhydroponics.com check out the DWC oxyponic set..

I got 5ft monsters in this hydro bucket.

Do you have any problems with over crowding? Thats one thing I was worried about with the smaller set ups I am choosing from

Also, with the second one what would I need to do to add a drip system to it?

the second one comes with the drip system. Well, over crowding can be a problem..Hydro grows beast plants very fast.