Which Dynaudio to buy under 2k used

I think the Contour line offers the best value.

I'm partial to monitors over floorstanders in general in this price range. Add a sub later but only if needed.

The 1.3 mkIIs are very fine and well reviewed monitors. They work best on very solid stands and can be had for well under $2K which leaves room for the stands to go with them.

Mine cost me about $1200 with matching Dyn stands on ebay a couple years back.

They are rear ported though and generally work best when placed well out away from walls. That can be a problem in some rooms.

Also note that these Dyns tend to like lots of power so they are not the best choice for low powered amps. I think the McCormick would be an ideal match though!

My recommendation would be partially based on how far away you'd be sitting, and whether your budget is the maximum you want to spend and the lower the better, or you're fine with $2K and would go another couple hundred if that's what it took.

If you're going to sit < approx 10 feet away, I'd go with one of their two-way monitors. The Contour 1.3's and a good pair of stands could easily be had for less than $1500. I've owned many pairs of Dynaudio's, but I haven't heard the new Focus line. My guess is you'll pay more for those, since they're newer, though you could still get a nice setup for no more than $2K.

If you will be sitting back 10 or more feet, and a floorstander interests you, I'd look for the Contour 1.8 Mk II's or, alternatively, the Audience 72SE's. I have no experience with the latter, though many speak very highly of them. The 1.8's can definitely be driven well with modest amplification, and do quite nicely. Again, both can be done, definitely, under $2K.

If you're willing to look, and if $2K is a target, not an absolute, I'd look for either a pair of Contour 2.8 floorstanders or Confidence 3's. The former would be a bit more than $2K likely, and the latter would be a few hundred more (including the stands). Both have the Esotar tweeter, which is phenomenal. I owned the 3's a couple times, and could easily live with them forever if I had a medium-sized room.

I love the Dyns for a wide variety of music genres.

how big is medium sized?

I wouldn't use dynaudios in a room any smaller than 16x16. They are awesome once they have some current running through them, but can be somewhat opaque if your room is too small to drive them with juice.