I'm a big integrated fan. I'm running Harbeth C7's with one. For $1500 absolutely stick with an integrated. If you want to upgrade, although the 2010s is nice (I had the 3010s2), there are several choices used that will move things up a notch or two. None will be separates.
But if your happy, just stay happy and save the $1500.
But if your happy, just stay happy and save the $1500.