I can agree with you both though I would suggest Aikijutsu rather than Aikido because it is also useful to survive a combat encounter while not causing physical harm for those that are on the more spiritual path, while Aikido while being a great system doesn’t necessarily “pass the test” if you actually get jumped. I agree with Streen that an martial art that you use should not limit you to one form or a memorized set of routines as “THE ANSWER” to a conflict situation. My own studies wit Kung FU followed more along the Jeet Kun Do path of adapt & modify. The same for the Japanese arts I have studied.
Jax is right though about finding what is available in your area. I would however warn against Tai Kwan Do. Black belts are handed out like candy in that system therefore building a false sense of confidence that could lead to danger if used in a real conflict. I also question Krav Maga. It is a great cardio work out – but you could get that at a kick boxing class at a gym. The problem I experienced testing Krav Maga was that it is that advancement is based on money not skill. If you paid enough and followed a few memorized patterns for the tests you could have our black belt quickly. I also got seriously hurt in some of the training drills in that class, because students are not taught control but rather to be as forceful as possible. Both thumbs were dislocated and possibly the small wrist bones behind them broken. Even a year later trying out a Kung Fu Dojo my thumbs quickly gave out during punch drills because of the damage sustained in the Krav Maga Dojo. So carefully consider what dojos are available to you. Don’t buy into the flash & dazzle marketing that some of them employ. I also shy away from dojos with walls of trophies because in my mind they are teaching you how to look pretty for judges not how to survive a fight.
The final thing to consider is your body type and possible physical limitations. If you are a high energy person something like Jeet Kun Do or Kung FU etc might be better, while those who want something softer and gentler something like Akido/ Akijutsu or even Tai Chi might be for you. I personally like a hard core work out that I come out of dripping with sweat. But my roommate Jedi Callista has serious physical limitations that keep her from being able to do a hard core work out. Aikido / Aikijutsu is wonderfully adaptable and gentle enough that even a person with serious physical disabilities can be effective. The Aikido dojo Callista is going to has been incredibly patient with her and been willing to adapt the moves so that even she can perform them.
Hopefully this helps you in your quest to find an appropriate martial system for you. :mara