Stay away from Sony, if you want to see how bad your Sony is, when you buy the new receiver, use the same speakers you have, and you will hear the difference immediately, even with crappy speakers.
As someone mentioned, you might not need a $1200.00 receiver, $$$ which you might want to upgrade your speakers, if needed. You might want to consider separates from Emotiva, or receivers by NAD or Outlaw. Marantz SR-7002 is THX, and might be what you are looking for, but it is in the top bracket of your budget.