Yeah I have probably spent about the same, because I have a 400w too that I use separately for veg, but I am going to add a 600
I top my plants, and some sit on cinder blocks and other things to accommodate height differences. Seems like we are setup about the same with some minor differences. lol.
Great looking healthy plant! If you don't have it already, get some Advanced Nutrients Bud Ignitor. The stuff works wonders. It starts in week two of flower and jump starts your buds. By week 4, my plants look about 2 weeks ahead of where they would be without it. Just a thought!