Is that your entire roster, or just a selection you want us to focus on?
Either way - Coldheart, Vogoth, Khatun, and Jorrg are all excellent choices. Personally I would stop with Warmaiden - leave her at 50, I don't think you need to bring her to 60.
Which of the four you choose is probably more based on what your focus is than anything else. I would do Coldheart/Jorrg for dungeons, Vogoth for CB, and Khatun for arena - but realistically whichever you choose to take to 60 will be on every one of your teams until you get a better replacement.