Supposedly the Trader Joe's brand doesn't need rinsing (or is pre-rinsed). I am so in the habit of rinsing quinoa that I usually rinse it anyway, though! It's certainly worth a try--it's a good price!
Also, and this is a little OT, have you tried the oven method for cooking it? I'm a decent cook (I hope!), but I always seem to screw up grains on the stove, so this (
http://www.beyondsalmon.com/2011/03/how-to-cook-quinoa.html) and Alton Brown's baked brown rice recipes were really helpful!