There has been a lot of debate about this...I myself posted a similar thread to help me dicide. Basically I gathered that if you go to the track a lot and don't do too much HWY driving than the 4.10's are the way to go. If you do a lot of highway driving and not much track then the 3.73. A lot of poeple are concerned with the RPM's on the highway. I myself am going to go with the 3.90's, couldn't make up my mind.
V8syndicateZ posted this so you can get an idea of the RPM's and speed in whatever gear.
www.tchracing.com/tech/gearcalc