I'll give it a try....
I haven't practised for very long, and from your description I think I can say, that most styles of Aikido will fit you just fine.
However I will give it a try:
I myself practice the so-called Aikikai-style. As far as I know, that's the style taught in the Main-dojo of Aikido in Japan. Each Sensei that teach this style adds small differ-ences and a personal touch to it. I practice the style created by Shoji Nishio Sensei who travels a lot to the states and the northern part of Europe. If you go to this website you might get puzzled as it is in Swedish, but you can find a link to a page with mpeg clips that shows some of techniques practised in this style.
There is a style by a Sensei called Tomiki Sensei. I know very little of this, but as I un-derstand, the main difference between this style and most of the other styles of Aikido is, that in Tomiki style Aikido it is common to have competitions, which is otherwise considered impossible in most other styles.
In O-Sensei's old dojo in Iwama (a small Japanese village) one of O-Senseis very close students called Saito Sensei teaches Iwamaryu Aikido. It is claimed that this style is taught the way O-Sensei thought Aikido just before he past away. I cannot explain to you exactly what makes it different from Aikikai aikido, so you will have to ask some-body else if you want to look into that.
Some dojo's put a lot of attention to the effectiveness of the techniques - while other dojo's focus more on Aikido as a means toward enlightenment. What suits you best is for you to find out.
I guess the best advice I can give you is to go and watch classes in a couple of dojo's and perhaps talk to some of the instructors or senior students. Ask them what style they practice and what they consider great about it. Take some time to decide which dojo you liked. It can be for many different reasons, but remember that it will be a place you will spend a lot of time in and people you will see a lot, so go for the place that makes you feel the least uncomfortably.
I hope this helps. If you have questions to my answer then post them or mail me. I'll be happy to try and help you.
The best of luck