Welcome on board ^^

Just as people were saying for ps3 users you can just use the pc/laptop or whatever ppl use to do voice chat and yes in my case of my ls we used skype for many reasons. Primary because voice output was the best of them all. On ventrillo was awful (robotic voices ugh). And second skype is free but on negative point is you need to do everytime a call to the friends instead ventrillo/teamspeak/mumble having channels rooms. Besides that skype is the best imo.

About PS3... don't buy it. PS4 is coming this year is going to be a waste of money... save it for PS4 and play with graphics on low/medium for a bit if your pc is weak. That was what I would do