Blackberry curve 8520 vs Blackberry Bold 9780?

After a Blackberry!
Not sure what the difference between the bold and the curve is and whether it's worth the extra money?
I will use it for emails and facebook etc.
I would like a 'decent' camera as the one on my current phone is awful and I really like having this feature. Any honest advice please?

bold 9780 has the new 0s 6 which is excellent
it has a 5mp camera
it has more memory
its 3x faster than the curve
it has wifi n and 3g
you can multitask easily
the new web kit lets you open multitabs
the build quality is excellent.