Since he's wearing the captain's armband, pretty sure Peralta is #2 who scores on the free kick at around 0:40.
I don't know a whole lot about Argentina's Second Division, but in looking through a bunch of Almirante Brown highlights on YouTube, the level of play there has impressed me. A lot of solid, aggressive passing. Probably a bit higher level than the MLS, but not much.
Proof that there's not a whole lot of information about Gonzalo Peralta on the internet right now: My blog post yesterday is currently the number 4 hit on Google when you search for his name.