You might get some heat for this thread b/c there are a bunch out there for it, but for my two cents- I run (now, with the .151 upgrade) between 30 and 35. A lot of people on here run in the 40s after a battery pull, and you will find just as many who run in the 20s. It's all user-and-Storm specific, and as long as the phone is running fine, no need to worry.
as long as you are not getting the clock all the time you are fine. Once you start getting the spinning clock you will probably be very low on mem and need a reboot.
edit: Morf! where have you been, hiding out in the Tour forum eh?