im running a 2.8GHz 15inch. The processor bump to 2.93 would be virtually unnoticeable to me and whilst 8GB ram would be nice, 4GB does me fine and once the firmware restriction is lifted on the 15inch models im putting another 4gb in. So on that basis im not regretting getting my 15inch in the slightest.
Sure a better resolution would be nice, but 17inch to me defeats the point of a laptop, its simply too big, so you may as well go for a desktop. Im gonna save my money for a nice 22 inch monitor and then i shall be a happy chappy would a beast of a mbp and a glorious display to run it through when at home.