I've been learning Mag Krava and Bujinkan Taijutsu/toshindo for a while.

Mag Krava is simple, and very practical. The basic elements are effective, covered quickly, and are easy to learn. To be really good though- like with any martial art- you need to train constantly and continue learning new techniques as often as possible.

Bujinkan Taijutsu isn't really a martial art, per se, it's more like a philosophy. It includes hand-to-hand combat, but also stealth tactics (infiltration, escape, etc) and guerrilla warfare tactics, amongst other things.

The best thing about these two is that they are really very practical. Unlike most martial arts, they do not rely on one's ability to simply replicate mechanical motions (which are invariably based on arbitrary rules that don't apply to life-or-death combat), but on one's ability to actually defend themselves in any given situation, so the training is quite effective for preparing oneself to deal with actual combat.

Very good stuff to know if you want to go into the military special forces (or are already in), or police SWAT. You'll be ahead of the game before you've even gone through advanced training (especially if you've spent time doing the workout routines that are integral to these martial arts).