If you like the snake, then buy it. Regardless of what people are saying the colors are not bad. I'd estimate that she's somewhere at 600+ grams and is still fairly bright, taking into account her sex, age, size, color, temperament, willingness to feed. She's not a bad snake at all. Offer the owner $400.00 and see what they say.
According to her feed chart, she weighed 228 grams on 4/25/13 and last shed on 3/21/13. She also is a very good feeder and has consistently eaten about once a week. She's currently on weaned rats and will eat live or pre-killed.