With 400 hours you need total time. Whether it be 135 or 121, you wont be able to get a PIC position in a jet until you have 1500 hours and the CRJ is the fastest way to get there. Also, don't try logging PIC when you are not dispatched as such, regardless of how you read the FAR's. No airline or fractional worth their salt will accept it, and trying to count it may get you "busted," i.e. no interview. For better or worse, you've got a jump on your carreer that most folks never could have had just a few years ago. Slow down and enjoy the ride.