Thanks for your replies. I recently picked up some weights and wanted to have the facilities to use them properly. Will have the chance to try out a bench and ball later this week.

I was in Ochner Sports last night and they just had one size of ball 55/65cm. They mention on the box the suitable heights and say 100degrees is recommended (which makes sense as when your legs are at 90degrees you have little power). They also had the suitable heights on the box and mentioned the other sizes available with details.

So sounds like you should have the next size up.

This is all to suppliment the following equipment:

Cross-Trainer
Concept II rowing machine (an old noisy fan one, not the nice new quite one's)
Road bike on track stand.

Plus: Cycling, Swimming & Kayaking when I can (which is not often enough, but I'm hope to improve this).