Power Juicer machines are made with solid white plastic components or stainless steel. Less common, but still an option are the machines made with black plastic. The Jack LaLanne stainless steel power juicer models, naturally, are more expensive than their white (or black) plastic counter-parts. The stainless steel Power Juicer machines are generally in the $120 - $150 price range, with the plastic machines selling for $90 - $100.
It is important to note that the white plastic models, which are the Power Juicer Classic and the Power Juicer Express, are very sturdy machines even if they are not made with stainless steel. There is not much in it, if we are talking about strength. However, there are other reasons that people choose a Jack LaLanne stainless steel power juicer over the plastic machines.
First, stainless steel looks nicer. You cant beat the look of a stainless steel juicer, and even if the white plastic Power Juicer machines are solid, whit plastic still has a 'cheap appearance' about it. Second, and most importantly, stainless steel doesn't stain! A major complaint with the white plastic models is that they get stained from the juice they are making, especially from carrot juice. And as time goes on they start to get more unsightly. The black plastic machines also get stained, but the black coloring disguises it somewhat, compared to 'show-all' white.
If the staining is an issue for you, then it worth spending the extra $20 - $50 to avoid this issue. The three stainless steel models are the Power Juicer Deluxe, Power Juicer Pro, and the Power Juicer Elite. Enjoy a stain-free future!