If you have more space, get a bigger tent. Yes you can fit 3-4 in there, but more space is always better. Especially if we talk comfort, which its seems to me your aiming for. Also buy that stuff single wise not as a kit. You dont need the glasses, net, overprized fan, scissors, all that stuff.
You need atleast 250w per squarefeet even tho i would aim for 400-500 for best results.
All lights on the market are good and pretty similar, just stick to brands like Marshydro, Viparspectra, lumatek, Phlizon(cheap alternative), HLG(pricy UK), Greenception(new German product).