I admit defeat, using standard notation I can't think of a better ratio of numeric length vs symbolic representation. Well played!

Aaronson's got a blog entry tangentially related to this competition

http://www.scottaaronson.com/writings/bignumbers.html

"In an old joke, two noblemen vie to name the bigger number. The first, after ruminating for hours, triumphantly announces "Eighty-three!" The second, mightily impressed, replies "You win.""