If you end up getting an HID system, don't let the leaves get wet when they the HID is on, It can burn holes in the leaves as the water droplets act like a magnifying glass. Other than that, so far so good. Are those clones or from seed?
Thats looking really good.
Although If I were you id start growing out with soil,
then move up to hydro.
But its your choice,
they look healthy from the picture.
Happy Growing!
NoB