Another problem is that if I get the 50/1.4, getting the DA* 16-50 seems to be a bit of a waste, considering I have a Sigma 20-40/2.8, even though the 16-50 looks pretty damn good.

I'm also mad keen on the DA*50-135, which coupled with either the 20-40+50 or the 16-50 would be my ideal snow shooting kit; the core reason why I've got the setups.

Guess we'll wait and see whether or not the DA*'s are worth it before I make any big buys.
For all your umbrella needs!