Oh man, I think I would be ticked too!
I found the Derwents at the art store that I frequent. A set of 72 is $99. The current set of prismacolours I have now (72) is $71.
Perhaps, when this prismacolour set is done, I will invest in the derwents. They have a set of 12 for $18, so I may try them in the mean time.
I do like the prismas, its just the breaking part that I hate - LOL.
Thanks for the recommendation Smkie!