Yes most of the time people run 5x5 with a 4x4 tray. Active aqua has a new table that the outside of the table is 4x4 instead in the inner being 4x4 so it will fit in your tent. Msrp is 80 so pretty good back for the buck!
5 lbs in a 5x5 space :clap:
Starting out in SOG you will net about 10-15g a plant till you understand the strain. Shoot for a gram a watt and go from there.
What are your end goals? 1000 is always going to have the potential to produce more but you do need to factor in the heat in a small area. I went with a 1000 because I didnt want to have to buy a bigger ballest and light if I wanted more.