Integrateds... I really like my Esoteric preamp and amp. Here is the top flying integrated, which was recently phased out, but it is still outstanding.
The current holder and lead model is Esoteric's F-03A; read about here:
A few years ago, when I was looking to put together a simple system, I wanted to get a Pass Labs Int 250. A solid preamp and great amp all in one. I let a used one get away for something like $6,500.00 dollars. Not a small sum of money, but for that model, that was a good price.