I'm considering an upgrade also. Mine is a 2000 or 2001 Champion Buck. Comparing it to the newer ones there wasn't as much difference in speed and energy as you might think.
I took the IBO published speed for a couple of bows, surfed over to archerycalculator.com, and input my draw length and weight, and the speed came down drastically. The new bows had higher speed and energy than my 15+ bow, but not as much as I expected.
I've also decided I'm not buying a bow unless I get to shoot it first. But being a lefty, my "try before you buy" options may be righty only.