1114 gets another vote from me. Also, 573:
http://www.chiefdelphi.com/media/img...b9935425_l.jpg
I dont know why it works so well, but it does hold and cap quite well.
I'll go with team 65 (huskie brigade) as a good capping robot as well.
I'm also a fan of 71's gripper. I think there are a few things that would quickly improve it in small ways, but it does a good job scooping tubes up, and a decent job capping too.