I don't remember the exact numbers, but I've spaced the margins out so that the text almost fills the screen and I too did not like the look of justified text. I may have my font a little bigger than yours, but I am using an older phone with a smaller screen than the Nexus One. I also prefer light text on a dark background all the time, but I've found that I do most of my reading at night anyway.
I have been using stanza on an Ipod Touch for the past year or so and I probably prefer it over Aldiko partly because the hardware I'm running Android on is older, but Stanza is also much smoother and offers preference options not available on Aldiko. For instance, I can set Stanza up with a font that I really like, not just the one (of the 3) that I dislike the least. The color options also suit me better and I really like the page turning animation better than Aldiko's slide.
I'm hoping that Aldiko gets better, but I will be using it regardless, because I want to be able to do my reading on the device that I have with me.
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