Go get Revit, you wont be disappointed! Revit 9.0 is due to be released in Spring 2006, and there are rumors to an 8.1 release in the fall. Revit Structures debutted in June, and Revit Systems (MEP) is scheduled for Summer 2006.
Big firms are making the switch, including HOK and SOM. I heard a rumor recently that Gensler is making the switch, but that is unconfirmed.
I say this, because you are asking the question at the right time. Revit is really taking off now. The US is a bit behind, but in Australia Revit outsells ADT at something like 20 to 1. Take this opportunity to learn it now, and be a very valueable employee!
Saw your profile says LA, and you are a student? Cal Poly? Learn Revit, and I could get you a job at several LA area firms, including mine.