So I'm on my second yoga mat within 2 months and I think I need to splurge and buy something decent. They keep ripping up and I'm willing to splurge (ok, it's my birthday so this is going to be a gift to me!). What do you use? Is the $70 "the mat" from Lululemon worth the splurge? I can't keep spending $20 each month for a mat! Oy!