One of my most favorite Gelbvieh bulls for producing wonderful daughters is Polled Summit. They have good dispositions, milk well (but not too much), have great longevity, produce thick, meaty progeny, and have a wonderful feminine appearance.
Other Gelbvieh sires known for producing good daughters are:
Black Image
Floto
Pld Resource
Polled Gizmo, though his daughters can have too much milk
Extra
We've had a couple Ideal daughters in production so far, but I must admit I've been a bit disappointed in them. They both were larger framed than I anticipated, milked more than I would prefer, and didn't have the greatest teats and udders. One of the Ideal daughters had a uterine prolapse so after she weaned her calf she went to town (we don't tolerate problems).
We have a couple more Ideal daughters that are bred and due with their first calves in the Spring so I haven't totally written off Ideal yet.