About twenty years ago I bought (and assembled) a Hafler DH100 preamp and DH220 power amp. The power amp died in the left channel last week. Instead of getting it fixed, I decided to get a new one. When I bought the Hafler I was single; now I am married with a son, a mortgage, and two car notes. So I looked around on the internet and decided on the AudioSource AMP One / A for $200. I really like it. It makes my Polk bookshelf speakers sound better than ever. I cannot make a direct comparison with the Hafler DH200 because it has been over a year since I hooked up the Hafler stuff with the Polks.

I do not know anything about the AudioSource preamp that goes with the AMP One / A, because I am still using my DH100 Preamp. But AudioSource seems to be the way to go if you want to get into separates without spending major bucks. Peace.