Welcome to the forums!
I don't own either console, but whenever I'm considering the purchase of a new system, I base my decision solely on a comparison of the available and upcoming exclusives that I would want to play. Everything else - i.e. features, other consoles don't have - is secondary to me and "just" a welcome bonus.
You are obviously interested in more PS3 exclusives, so I'd say get a PS3.
Bonus in this case: Your family gets a BluRay player.








