I've been using OmniGraffle + elwebUI stencil for years now and I'm very happy. OmniGraffle allows me to draw very very fast. All wireframe a are vector based a

I've been using OmniGraffle + elwebUI stencil for years now and I'm very happy. OmniGraffle allows me to draw very very fast. All wireframe a are vector based and look great as PDFs. You should give it a try.