I say - splash the cash and buy them both.
The longer this season drags on, the more convinced I am that Drogs is not going to be here next season - meaning that the days of playing decent attacking football with a single striker will soon be over.
That means 2 up front next season - and that means at least 4 TOP QUALITY strikers are required in the squad. At the moment, without Drogba, we don't have any.
Berbatov and Anelka are top quality and available now. If we dither on either of them, they will be snapped up by the likes of United, Arsenal or the top European clubs at the end of the season.
Buying them now will give them six months to settle (they probably won't need that long anyway, as they are both established premiership players) so that we can hit the ground running next season, as well as having a tilt at all three cup competitions this season.