So you want to replace your crank because the chain rings are riveted? Do you plan to mix and match different chainrings?

I think I'd only replace the crank when the tooth are worn out or you need different gear ratios. But to replace because they are riveted together is kinda silly isn't it?

Anyhoo, I think this set is a a buy if all you want are bolt-on chainrings. The Alivio is one step below the Deore however it's half the price. You don't even have to replace the BB.
http://www.amazon.com/Shimano-FC-M41...1271849&sr=8-1