Internal DAC quality vs external DAC's

Considering what path/options to take on a 2channel streaming setup !!!

I'm considering integrated amps from the likes of Hegal H120/H190, Peachtree Nova 150, Anthem STR and the NAD M10 V2

I would like to hear some opinions on their internal DAC's and how they would compare to external DAC's under $1500. (Aries 2 and Bitfrost seem to be a popular choices.)

Or perhaps the better question might be, What price point would best the internal DAC's of these units ?

I'm not looking for exact detail, just some information to help guide me through the integrated vs separates debate.