They are aren't they? And they carry dies from some other companies that I haven't seen anywhere else. I see that the name of the store was scrubbed, but if anyone else is interested shoot me a pm and I will send a link. I have already pm'd Holly. I hope she checks her pm's!
To some degree it depends on which size you want. For the smaller size, as many have said, the Martha Stewart punch is nice. Its also quick to use and easy to find both online and in box stores. For larger intricate ones, I have the Cheery Lynn Design dies, of course I have only seen them at scrapping shows or online.
I like the newer one from Stampin Up. I have the old one but I think I need to upgrade to the new one!!!! I don't do a lot of butterflies since I have boys. Some of the dies listed here are beautiful but I know I wouldn't get enough use out of them though.
I am glad you asked this question as I am huge fan of butterflies as well and use them often. Although I only have a tiny butterfly punch from CM. I am definitely going to be upgrading in the near future. I have been looking for a good butterfly stamp but haven't found one yet. Does anybody know of a good butterfly stamp?