Being that I live in leggings - this isn't a current obsession - it's a complete obsession that I have had for years, (I think I own 2 pairs of real denim jeans). I have become a self-proclaimed expert in what brands and what stores to shop at for prime quality leggings.
Walmart and Target have cheap leggings, but that is all they are – cheap. For around $5, you get basically see-through leggings, that after a few washes, are almost translucent.
Victoria Secrets has amazing leggings, however they are much more expensive, around $25 per pair (sometimes with a sale of 2/$40). But then unless you are purchasing a lot, you have shipping and so forth – can be expensive.
For basic leggings, LC Lauren Conrad at Kohls are phenomenal. Kohls always has sales and coupons, making you never having to pay full price. This past week I got great wearing, great-washing leggings for under $15! Yay!
For a thicker legging, for that dressier or denim look, depending on the sales at the time, I would go with Hue leggings or the LC Lauren Conrad terry leggings. LOVE! They are dressier yet sleek and chic for any style and occasion! Both prices in the $30's.