Brendan, check out Head-fi.org. What I find annoying about Shures is that their cables tend to fray and break, and sometimes if you run out of warranty that makes them un-replaceable. Tapioca, Denon earbuds are relatively new, I haven't heard them yet.
For cheap earbuds that are constructed quite robustly try Yuin:
http://head-direct.com/products.php?c=1 They look like your average earbuds, but they're solid and they sound good. Lots of people on Head-fi use them.
http://www.jaben.net/shopping/ These guys also have great deals on headphones... Uncle Wilson is awesome.