Best way to track and record your collection?

This post brought a new site I’ve never heard of to my attention: GameValueNow. Looks really slick. Anyone here use it much? I track my collection (or most of it) on a spread sheet, but I’m looking to use an online database like this or PriceCharting to track what I have and the approximate value. I see some good recommendations here but I really want something that can give me an idea of value so it looks like PriceCharting and this site are the best options?