I'd pick neither. Went for a Mac Pro, with matte displays of my choosing instead. Mobile image accuracy isn't too important to me, thankfully, and I'm sure those who need it will take matte, but... it's annoying that the unibody was clearly designed to be a glossy machine. As someone above said, when you're dropping $x,000 on a machine, form as well as function may be a factor in your purchase.
If someone wants a matte display that's fine, I have no issue with that. What I do find annoying is that it seems all those who want matte believe those who want glossy are wrong.
They are not, it's a personal preference. Matte is not inherently better. It takes a sharp defined glare and makes it a washed out overall glare. It does not eliminate glare, it just shows it differently.
And on a last note, matte is not more accurate than glossy. There are been comparisons in photography forums about comparing calibrated displays and the difference was negligible. Here's an article from a respected photographer with the glossy displays that finds them the best MBP displays yet from a color standpoint:
http://www.robgalbraith.com/bins/multi_page.asp?cid=7-10041-10146