my personal opinion on dirt drops: don't bother getting them.
some 44cm FSA compact bars are WAY better.
they're not as clunky and bulky as dirt drops, they're narrower and most of all, you can use all the hand positions, unlike drops only with dirt drops.
You can use all the hand positions on the Bell Laps. They're slightly wider than road bars along the top flare a bit in the drops, so that they get quite a bit wider by the bar ends. Not all dirt drops are as extreme as, say, the Midge Bars you see on monster crossers.
The Bell Laps are a nice all-rounder with quite a bit more steering power and stability than normal drops and few drawbacks. Some people mount them a bit higher than usual so that they spend more time in the drops, because the steering works so well - in this position the slightly raised on-the-hoods position is terrific in traffic - you get lots of look-around.