Dude. I like Gracie BJJ, but damn.
I know. The form's lived a lot of that crap down by now, and even when decent competition came along, Royce Gracie did alright. He's a pretty good fighter. Boring as hell, but skilled.
I'd like to see krav in the UFC, but the only instructor we had crazy enough to try turned out to not be quite crazy enough.
I can see that, actually. A lot of the most pragmatic fighting styles use techniques that are illegal in competition. I don't know much about krav, but I wouldn't be surprised...
Anyone out there who's trained heavily both up and down?
Nowadays, pretty much everyone. It's necessary. The first wave, as stated was BJJ. The second wave was wrestlers, who pretty much invented the 'Ground and Pound' style of fighting. Take the guy down and get on top, then punch instead of going for a choke or armbar or whatever.
The third wave was the return of the strikers. kickboxers and other stand up fighters cross trained in ground techniques and takedown defense. Once they knew they had the tools to keep a fight standing, or avoid submission attempts if it did go to the ground, the strikers gained some confidence, and you began to see some high kicks once in a while. Occasionally, someone would bust out a spinning backfist or a flying double knee strike or something crazy like that.
Nowadays, things have pretty much equalized, and things depend more on the actual fighters than the styles they prefer.