Ultrasabers: Where creativity was achieved a long, long time ago...
Lol what everyone else said. Most of the time we all have a mixture of Forms...but either way you go, have fun and practice whatever is comfortable. Now take me for example.. I automatically assumed since I was a taller, stronger guy that Djem So was the right way to go. And it was pretty comfortable to practice moves or applications regarding Form V. I went through a ton of trials and errors and eventually discovered that Form II, Makashi was the most suited for me. Everything about it is just easier for me and I think that is important!
You'll find your niche, don't worry

Makashi is a pretty good pick for tall guys, since you can use your distance to your advantage. Of course, as you said, it's whatever you're comfortable with. (btw I just noticed the Grandma's Boy quote in your sig - nice!)
From what you said Soresu sounds accurate.