Also, Aspen Clearance is going to be hoppin' for a long time. What's likely to happen is that Aspen will clear you out of the area per their SOP, but re-routes for the destination area won't happen until you're with Denver center at the earliest (depending on their Letter of Agreement with ZLA), or more likely, from LA Center.So, you may well get cleared as filed (or have a SID thrown at you, at worst), then just when you think the coast is clear, you get a re-route later in the flight. Anyone who's flown IFR in the NE up and down the coast has seen that pattern many a time
In short, plan something reasonable, then be prepared for changes from LA Center along the way. It'll spice things up on the enroute level to get some re-routes anyway!
