Hello,
did you check out the links to the graphics showing the apparent field of view?
A wide angle eyepiece shows a larger piece of the sky. This makes finding and tracking objects easier, and just looks great :-) http://picpaste.com/fieldofview6mm66-taFA8uNA.png
The $30-$40 "Gold line" are just the nickname for the no-name eyepieces (that are identical to a $70 eyepiece called Orion Expanse). They are sold from various companies, brand or no brand. http://www.amazon.com/Orion-8923-Expanse-Telescope-Eyepiece/dp/B0000XMXZM - No need to pay the higher price in my opinion. A german site once compared brand name VS no name and the difference was minimal, some no-names even had better blackened barrels.
It's more about eyepiece types than brands. Many brands have identical or similar eyepieces, and there are quite a few clones of eyepieces. E.g. you can spend 700€ for a eyepiece, or $300 for a clone.
If you aren't set to Amazon you can get some of these things cheaper or different variants with other features.
e.g.
http://corvus-optics.com/product/planetary-eyepieces/
http://agenaastro.com/bst-1-25-telescope-polarizing-filter-set-eyepiece-holder.html
http://www.optcorp.com/eyepieces/all-eyepieces-not-sets-kits/explore-scientific-30mm-70-degree-2-eyepiece.html - better SWAN33, Q70 or perhaps the 30mm80° ultra-wide angle (though this "cheap" one will degrade in sharpness in the outer field of view a bit)
Telescope accessories are a confusing, complex topic, and it's easier to spend more on eyepieces than on the telescope itself :-)