I really like Full Line Stencils. They have a mesh instead of cut outs so you can only use chalk pounce with them. They make a very nice line.
I also use regular cut out ones from Joanns that I get with coupons. I use the blue wash out pens and the dissapearing ink pens alot. Both work well. Marking pencils dont work for me, very hard to get them to mark.