I cannot and will not recommend spending that much money on a bag that is going to last you only a few years. That much spent on a high quality down bag will last a lifetime. If you absolutely must have synthetic, don't spend that kind of money since you'll have to replace it 3-5 years down the road.

I can tell you from personal experience that a wet synthetic bag is just as cold--and useless--as a wet down bag! That's the same occasion in which I learned to be ultra careful not to select a campsite that will turn into a lake during a cloudburst followed by several inches of snow. Whatever form of insulation you use, you absolutely must keep it dry!