Looks like it's early 90's 105, judging by the 1st Gen, 8s brifters, brakes and crank set. Like KonAaron said, it's an average bike... nothing mega-spectacular.

That being said, "Beauty IS in the eye of the Beholder". If everything works well, it fits you, and you like the way she rides then go for it! The ultimate judgement of its value is up to you.