Aila, I think once you are there, maintainance can be what you chose. I happen to love slow and heavy and tolerate high rep. It's so painful!

Right now I want to work my rear delts and triceps since they are needy and I am not capable of doing heavy work with those muscles, so it's endurance. But the important thing is getting the muscle laid down. Once it's there, it stays as long as you are consistant about strength training.
I haven't gotten quite up to speed on the endurance stuff yet in March due to a crazy week followed by a sinus infection but even with minimal endurance work, I have kept my muscle so I think I can do whatever appeals to me, strength or endurance, and do just fine. I like to change things constantly so this is a beautiful thing.
Slow and Heavy is my favorite and was the most effective for me in building but I had a blast taking the Pyramids up to very heavy weights and it's all been good! I am happy I can do them at lower weight too since I love knowing exactly what's coming and I never manage to keep track of reps during high rep work. I have never stuck to one type of training for so long but Susan recommended doing so and I let my muscles determine how long and went up gradually. It was gratifying to see my muscle come back. I think you should do a heavy rotation to build muscle and strength. Your maintainace can be the type of work you like the best or a mix and match of all the awesome workouts Cathe has given us over the years.
I am shelving circuit training unless I really have to fit strength and cardio into one workout because of time restraints. I tend to be rather hoppy by nature and it feels so rushed and manic to me that I want to do cardio and strength on separate days and really focus on each one. I have added yoga very consistantly and love it. It gets my triceps and delts, keeps me flexible and mellows me out. I need to hit PH, MIS and ME in the coming weeks along with BodyMax and STP. And then I'll treat myslef to Slow & Heavy again! So many workouts, so little time!
Which ones do you use? Do you prefer one type of work over the other? It has to work for you! I am rambling, aren't I!
Bobbi
http://www.handykult.de/plaudersmilies.de/chicken.gif "Chick's rule!"