Thanks for the quick feedback fellas.
growwwwwww - thats my thinking exactly. the tops are looking awesome and the budsites JUST below the tops look pretty good but there are only a few hairs on the very lower shoots. HPS has the penetrating power i would need to get those lower shoots, without upping my energy use (too much) and without causing a spike in my temps.
SICC - i'm fine with what i have, so if i were to upgrade it would be something cheap like the 150 Sun System. everything i've read so far says the difference in temperature/heat output between 150 and 250 is ridiculous. forgot who the grower is, on this forum, he's using the 150 i'd like and he keeps it about 6 inches from the tops with no discernable increase in heat and no real damage to his buds. sounds like a good fit for my little tent.
2'x2' is the recommended maximum dimensions for a 150W HPS. which is actually just a LITTLE bigger than the dimensions i have in my tent. so in essence, 150W HPS is the ideal for my tent. hmm... my girl gives me shit every time i dump cash into growing

. BUT! If i don't start to see some development on the Lemon Skunk (which looks to JUST be starting to bloom) by the weekend, i'll probably be ordering.

Shack
If you got the 150w hps deffo go for it. i think those plants look like they are quite big for just a 125w cfl, they will have nice tops btu nothing lower down i recon. Looking real good though, nice and healthy plants, cant wait to see the results