Before you buy a D115 consider how you will handle it’s servicing, especially just simple tube changes. Biasing this amp is a bitch. And if a tube blows, and they do, it will take out a resistor in the bias circuit which will have to be replaced as well. If you can do this, or have a local techie that can do this (i.e. experience with ARC products) you’re in hog heaven. The D115II is a nice amp but I didn’t keep mine long. I used it with the SP10II which I kept for another 25 years. I replaced the D115 with a Threshold SA 3, a solid state amp every bit as good as the D115.
Good luck.
Good luck.