I'm not sure I understand what you're trying to do: maintain weight through cardio and build muscle/strengthen bones with weight-lifting? Or body-fat loss and specific muscle definition? I agree with others that 90minute cardio is a lot, particularly if it's weight maintenance.

I recommend Krista's site for lifting, Stumpuous.com and Bill Phillips Body-for-Life book and site (skip the diet advice, obviously). They might have ideas on how best to prioritize your work for the goals you want to attain. And I've gotten lots of good ideas reading the workouts people have posted in the Gym Logs thread here.

Cheers--
Terry-24