Regal 93 water pump / belt slipping

Well i had just fixed the TPS and the car was running fine but today it died again. Out of nowhere i just got the check gages and the power steering was dead, could only use the "normal" steering with lots of force. Pulled over, looked at the steering fluid - good level. But there was lots of water on the side with the belt. Didnt really care about the water leak and decided to drive back home. Another half mile and the engine died completely. The belt was off completely. Bought new belt, slipped again. Apparently the pulley on the water pump is moving in all directions so i'll have to replace the waterpump tomorrow. Luckily the engine didnt overheat as far as i can tell (it ran nicely after chaning the belt).
Any other things i should do (replace) while i'm in there? The images in the Haynes manual show it's a pretty easy job. Should i expect anything (bad) that's not in the book?

Thanks.

OK i replaced the water pump and the power steering is working again along with the rest of the car. Was a bit tricky to remove air from cooling system (had to open radiator cap while car was running). Looks good for now.