You should purchase a TeleVue 27mm Panoptic. This eyepiece will work good in your Schmidt-Newt. The formula for maximum "minimum" focal length for an eyepiece is focal ratio multiplied by seven (4 X 7 = 28mm).
You can't go wrong with this eyepiece for low power in any scope.
My 34 mm Axiom is quite good in my AT1010, but as others have mentioned about other not-so-expensive eps, it may be not so great in an f/4. Your best bet is probably a 40 mm Pentax XL. They come up on Astromart every so often for about $200.