It is hard to find good masking tape locally at a reasonable price. I started using Blick brand masking tape from Dick Blick on the web (www.dickblick.com) last year.
I like it. The price is reasonable. Yea, it is a bit thin and feels cheap. But, it works good. The glue is good. I often leave it on pieces for days or even weeks and have not run into any problems removing it. I find myself using this tape more and more often rather than purple or blue masking tape.
I actually like it because it is thin and thus bends easily. I can tape the 1/4″ wide edges of my plates with 2″ wide masking tape and then easily bend it around to cover the back.