What will you be using it for? If you are like me and it is mostly internet, Office/iWork, video streaming, occasional online play and possibly occasional gaming the 13" with SSD would be the better option in my research at least. That is what I will be doing, dropping in an Intel X25-M 160gb SSD (possibly a 320gb if I wait until the end of the year and the pricing is decent). This upgrade will put my total cost at $1099 for the MBP (education discount) + $400 for the SSD = $1500. Still shy of the baseline 15" by $100, and a lot faster (from what I've researched) for booting, reading/writing files, running multiple applications, etc. All the stuff that matters to me, especially when running multiple spreadsheets and word docs and umpteen web tabs open with iTunes going. I could care less about pushing the envelope of my HD with the latest Photoshop or something like that.
Of course I prefer small laptops and always have, so the 15" definitely seemed too big for my needs when I was at the Apple store. Even though it looked very pretty with the hi res and anti-glare options.