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I'm not a big Tequila drinker, I'm a bourbon and gin guy, but when I do drink the agave I like to sip a small glass over time, so I tend to buy nice drinking stuff.
I tried all the Casamigos varieties a few months back at a tasting, and the Reposado really stood out as top notch, even more than their Anjeo. Its not overly cheap, it in that $50-$100 mid range category, but very worthwhile for price point and quality.