Sony was wise not to include wireless on the two lower models. It's just a waste of money unless your focus is on getting customers to buy from your store. Instead, they're playing to their strengths: better design, touch-screen functionality and the superior epub format. The pricing is clearly designed to allow retailers a bit of leeway for discounts.
The pictures from PCMag look pretty good. If they've got the Pearl screen and have solved the touchscreen glare issue then these are strong products.