Doh! I actually own OS. That was a typo. Yes, PS2 is correct. But yeah, I would buy Etrian Odyssey first.
Aw man. I thought it was a trap too. I liked it more that way.
Anyway, I can agree on Hitoshi Sakimoto's work sounding the same for the most part. A few of his soundtracks actually do sound different from his FF work though, but what does sound similar I still think is very well done. I like him, so whatever.