Hi C Hing, I think if you really go for the Dartzeel, the separate pre+power amp combo should be the first choice. I have auditioned both in several occasions and the differences are huge!!! The "great refinement" as well as the "natural sound characteristics" of the separate has gone completely. When you look at the spec and the price again, you'll understand what I mean. The integrated amp is much more powerful on spec for half the price. So you can guess what has been sacrificed in the end