Going from Kickboxing to Ju-jitsu I would expect Aikido could be the logical next step in your 'less-agressive-path'
When it comes to the spiritual side of Aikido, it is my experience that it's up to you how much you want to deal with it. Some dojo's have a tradition for exploring that side - some don't. The shihan I practice under (Nishio Sensei) talks very little of these matters (or so I've heard) but they are present in the way he performs the techniques.
Personally I try to live some of the aspects of Aikido, but I'm stil just a beginner and I am only dabbeling in the 'way' of Aikido. I try to avoid conflicts by blending (whatever that means), accept the fact that it takes discipline and hard work to evolve, and I try to keep at least some harmony in my life by carefully selecting how I spend my time. All very hard to do, but I think I'm slowly progressing.
Oh year.... Like Patrik I smile a lot more too. Whenever I am down after a long day of getting nowhere at work and utter caos in the family I go to practice and come home with a big fat grin on my face - at least most of the time
. Sometimes my wife actually orders me to go to class, if I don't really feel up to it for some reason. I guess it's kind of like a drug - getting hooked means you want more and more, and you get moody and sour when you can't get your regular amount (hmmm..... This doesn't sound as positive as intended
Anyway: I love practicing - even when I have a bad day and nothing works. I love the intensity of a good practice, I love the beauty of the moves, I really like the people in the dojo and I enjoy getting better step by step.
Enough babbeling for now. I need to exercise disciplin in the work area
. If you have any more questions post them here or mail me!