Pros & Cons of Buying an Integrated with Built-in DAC?

You sound pretty happy with your present set up, so why the desire to change?  I am guessing that for under 1K for a new DAC you will be making a lateral move. Not to disparage any DAC in that price range, but Hegel has a solid reputation and I suspect that the DAC  in your integrated would probably be comparable to others in that range.  Keep in my mind that I haven’t heard the Hegel, so I could be talking out of my a**...
  At 2K you are into some seriously good DACs by Mytek, Benchmark, Schiit and others.
  Of course you could get a used DAC, as you did with your amp

Thanks guys.😀
There were lots of talk about adding a separate DAC. I thought perhaps I could upgrade this way rather than ditching the Hegel. 
The SQ on Hegel 80 is solid. Just curious as to should I ditch it and update to better one up my one box to multiple, which I am planning on it and keep it the Hegel for my small room.

I owned both a Parasound P3 and P 5. I was told the P5 dac was really good. well, it was better than the Oppo redbook dac but the dac in the Audio Alchemy DAC/PRE is terrific

Sorry that did answer the OPs question

It seems dacs offer the biggest potential for sonic improvements , but outboard dacs can get pretty pricey. The AA DAC/PRE MSRP is $1999, a veritable hi-end bargain, especially when paired with AAs PA 1 stereo amp