it's a great lineup of studios. i do think Sony will purchase a few studios in the coming years - they were in the running for that company that Tencent ended up getting, and that was for around 1.2B, so they obviously have money to spend. Insomniac was around 280M if i remember rightly, so even with 'just' $1B, Sony could get some great value if they spend wisely. I would like to see some Japanese devs, like From or Platinum, which would bring something a bit different.
generally though, Sony should be looking at talented, smaller studios they can build up over time. Devs like Housemarque who are clearly talented could be built up over a couple of games to build AAA titles, if they wanted.
