Heh, and I was just about to post that I prefer the babylon theme because it looks more conservative...
I only lately looked into themes when bmarkus had posted a screenie related to "lost" search function, and since then I am much more happy with babylon in comparison with default which I had used all the time before; particularly babylon seems to me to be much more eye friendly.
gutmensch, I do not understand what exactly you refer to by 'font size 1'
Perhaps same theme could also look different with different browsers (or generally different setups)?
Summary: de gustibus et coloribus non est disputandum