I have to second groundhog's suggestion for Tracie Long. I've been a fan of hers since the original Firm days, followed her through the FitPrime days, and now am anxiously awaiting the issues she's facing at JustV to resolve so I can (hopefully!) purchase her new DVD's. Apparently she was either given bad advice or we don't know what (lots of speculation flying around, but no actual facts!! YOu know how that is - LOL!) and the new workouts are on DVD-R's, which are giving some people problems. They won't play on certain players.
I did preview a couple of Christi's workouts on Collage, and she looks very perky, energetic, and personable. The folks on VF who discuss her workouts seem to like her a lot. The last thing I need is more step and/or hi/low, so I'm not interested in her stuff, but if she ever starts making serious strength training or circuit workouts, I'm going to give her a try.
I haven't checked out the others you mentioned. I did try Mindy Mylrea but just couldn't get past the choppiness and unorganization of her routines. I'm spoiled by Cathe's organization!!
It's fun to try new things, but I find myself coming back every time to Cathe!! She's such a professional, and everything about her workouts is so well done. The editing, the lighting, the music, the cueing - everything! Tracie - IMHO - comes in a close second - in terms of personality and cueing. I know people nit-pick about things in Cathie's workouts, but when you compare them to everything else out there, they're as near to "perfect" as any human being can make them. I've actually (in the past - not recently) bought tapes that sounded great in Collage but were in reality so poorly made, or so poorly cued, or just plain BORING that I've used them once then threw them away. Some I won't even give away they're so awful. I can't imagine all that goes into making one, but if you're going to do it, do it right.
Also, I heard she isn't making any new ones, but I used to love Kari Anderson! I think you can probably find her stuff on Collage. Her sets were great, her music was upbeat, her cueing was right on, and her workouts kicked butt!!
Hope this helps!!
Carol