I've been practicing for ~20 years and my favorite mats are from
http://www.yogaprops.net/ -- I actually layer the 2mm "journey mat" on top of my Manduka Pro (which I never really broke in but it's very firm so layering doesn't lead to wrist discomfort... and the extra thickness helps with insulation against the cold concrete of my "garden hut a.k.a. workout room/home office"). I use the 4mm version on its own if I'm doing yoga in the main house (warmer and on hard wood floors) and when I'm travelling because the thickness is perfect for cushioning while not wrecking my wrists. Love 'em!