I'm putting together a 500pt SJL (Smallville Justice League) team with what I have, and I've come up with the following.

JL-060 - Superman - 283pts
JL-028 - Zatanna - 072pts
JL-014 - Green Arrow - 070pts
JL-011 - Black Canary - 050pts
TOTAL PTS - 475PTS

I just need 25pts worth of feats, and since I completely suck at using feats that actually incorporate the figure's powers and stats, I was hoping that I would check with you guys.

What are 25pts worth of feats that I should use? Battle conditions?

Well if I were you I would switch out The Justice Legion A Superman with The Justice League Of America Rare Piece and also throw on Kid Flash with Armor Piercing. I would put Shellhead,and Endurance on Big Blue and Streak Of Luck on Green Arrow and Black Canary to symbolize Zatanna's Rerolling ability after you push her. That gives about 35pts in Feats and slightly better team IMO

These are the only peices I have... aside from Gypsy and WonderWoman...

I'd go:

Nanobots on Zatanna (10 pts) - this will let you flutter between Prob and Outwit as needed

Armor Piercing on Green Arrow (10) - to help with Fusillade & Flurry

Lunge on Black Canary or Superman (5). Canary will be able to use it earlier but on Superman it will give him a huge HSS range and some mobility at the end of his dial (non-HSS part).

the only pieces for JL or the only pieces period?