a good and popular one is
http://preev.com although a bit limited in the choices offered.
This is nice too. I like those clean and simple just showing what you need.
Yeah i'm using this converted too. It worked smoothly.
Preev is good but at least we have alternatives like what the OP has shared. I can't give better alternatives because I'm also using preev as well. And the one you share is a better option specially the Bitcoin Graph. Clean no advertisement placement and its very fast.
I think I'm gonna used this exchanger very often because of the graph which preev does not offer. Good for those who wants to look at the historical price of bitcoin before making their decision to buy or sell.