I've tried several and it's kind of mixed bag of rod technology pushing the envelop. Besides the length, you want to look for a soft tip, light overall weight, and not too much weight at the tip end.
I bought a Cabelas 10' 4wt CZN first, but returned it as it was just too heavy.
I then bought a 10' 4 wt TFO BVK. I still own it and use it, but the tip is too stiff, it's a little heavy overall, and I've broken it twice while fishing. This rod is is better for fishing a large indicator than for Euro nymphing IMO.
Most recently I bought an Echo Shadow II 10' 2wt which I really like it. This has a much softer tip for loading the rod with short euro nymphing casts. It's also lighter and has a removable butt cap for adding weight to balance with your reel. I think the Echo Shadow II also comes in a 3wt and lists for $250. There's a kit available to extend the length and balance it. It's a really good quality euro nymphing rod for a good price IMO.
Kudos to PT for posting the shoot-out link. That was a good read, but unfortunately didn't include the Echo Shadow II.