FWIW, I had the Fascinate for two weeks and had some issues with call quality (buzzing in the earpiece and an echo)....returned it and got a Droid X instead. The Droid X's build quality is way better, feels substantial in your hand vs feeling light, cheap, and like I'm gonna drop it like the Fascinate. The screen on the X is no comparison to the Fascinate...the colors look more washed out and "blah" vs the Fascinate's screen which is simply amazing. Video quality on the X isn't as good either....I shot the same type of video in the same room with the same lighting on both phones, and the Fascinate's video looks like actual HD...the X, not so much...good, but nowhere near as good as the Fascinate. Also, the file size was much smaller for the same length video on the Fascinate...it records in mp4 rather than 3gp like the X uses.
Other than that, both phones are very similar...overall I still like the X better, battery life and call quality are great. If the X had the Fascinate's screen, it would be the best phone to date IMO.
good luck!
EDIT: also, rooting is much easier on the X as well...one app from the market to root (takes 5 minutes with one click), then one more app from the market to overclock up to 1.45ghz...very nice.