As the posters above indicated, there are a number of excellent integrateds out there at a number of price points. For me the advantages of separates are twofold:
1) They allow you greater flexibility in tweaking the sound of your system. Now this can be quite the rabbit hole as you try mixing and matching, but if you are so inclined separates can allow you to really dial in a sound you like.
2) Separate power supplies for the amp and preamp should provide a performance boost (all other things being equal, which of course they never are). Separate power supplies is also a big advantage of monoblocks vs. stereo amps.