Congrats on making the move to the Andra II speakers.
A couple of points of advice.
1. The Andra II does like a bit of power, so SET amps are probably not an option. (And even "normal" power tube amps, (i.e. 100 wpc or so), are probably not going to work as well as higher powered amps.) You probably don't need to go whole hog, like the aforementioned Pass X600 amps, but I'd recommend at least 150 wpc, and preferably 200 wpc.
The one tube amp I would not hesitate to recommend though is the 150wpc VAC Phi 300.1 stereo tube amp. It is not as powerful as the 220 wpc Lamm M2.2 hybrid monoblocks, but in a direct comparision between the two, (in a friend's system), the VAC had a sweeter mid-range and a more refined treble response. (However, the bass was definitely less deep and quick, and the initial strike from percussion instruments was a bit slower.) So there is a trade off between the two: so six of one, half a dozen of the other! (FYI: These are the two best high powered amplifiers that I know.)
2. The Andra II seems to have a touch of mid-bass bloom, at least in my room. Room treatments will probably be necessary to help control this. However, most true full range speakers, (especially vented speakers, which the Andra II are not), need some room treatments for this very reason. (FYI: I listen mostly to rock, so the extra bass reinforcment is not unwelcome.) I bring this up because if you choose an amp with a lot of deep bass response, (say something like a Krell amp), this might exasperate the mid-bass bloom. Also certain cables can also help or hinder the problem as well. I have found that the Nordost Valhalla worked much better than any other speaker cables I have used.
3. Positioning the speakers can be a bit tricky. It took me several positions to finally get them to sound their best. (Pushing them as far apart as possible, with just a bit of toe-in, worked best for me.)
4. Get used to dusting the speakers. That piano finish on the top really shows the dust. But they do look great when they're clean! I love those black granite side panels. ;-)
Well good luck, (assuming you get them)!