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I'm kind of partial to Bushmaster uppers, and 1:9 twists. For sub MOA accuracy at 600 yards, you should probably be thinking heavier match grade barrel. That's what I used when I used to shoot across the course matches from 200-600 yards. 1" under the forearm, and tapered down out front to meet service rifle rules. If weight is a huge concern, consider having it fluted. Obviously if you're going to be using a scope you'll be going flat top upper, but the Bushmaster national match uppers have sights with screw in apertures and 1/4" MOA adjustment.
Fore end use whatever you want, as long as you free float the barrel. Will you be shooting strictly prone off the bipod? In any other position, you may want to give more thought to adding a little overall weight to the rifle. Nothing is worse than having a match grade barrel up front and no weight in the ass end at all.
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