I didn't buy my Dream-Lite as a bottle gun, but I have converted it into one with the bottle adapter and aluminum bottle. For the lower cost I didn't believe that the aluminum bottle would feel significantly different when on the gun.
I will have to say that my initial assessment was wrong. That gun does feel pretty heavy with an aluminum bottle on the front. Of course it was pretty darned light to begin with.
Funny thing is that with the aluminum bottle the overall weight of the gun seems heavy to me, but bringing it up to your eye or holding it up while shouldered doesn't seem all that bad.
I love bottle guns and high shot counts, but if the difference between the aluminum and CF bottle you are seeing is $600, I would definitely go with the aluminum right now and upgrade later with an aftermarket bottle. Yes the aluminum bottle is heavier, but it doesn't make the gun unwieldy (just overall heavier to carry). And as far as my Dream-Lite goes, I could also improve its current overall weight situation by mounting a lighter scope.