I was referring to the gold line which has 66°. But it's only available as 6, 9, 15 and 20mm.
The TMB HR Planetary clones have ~58° but are also available as 2.5mm, 3.2mm, 4mm and many others.
The X-Cel aren't bad but I do not see the point why you would spend $65 on it when you can have the 3.2mm HR planetary for under $40 or the 6mm gold line for $24-$35?
A achromatic barlow will introduce chromatic aberration, lowering the contrast. Plus with some eyepiece/barlow combinations you will see dust specs on the lens.
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Or save up for http://www.optcorp.com/explore-scientific-4-7mm-82-degree-waterproof-eyepiece.html or http://www.amazon.com/Celestron-93432-Luminos-Eyepiece-Silver/dp/B00113NQAQ (
edit: http://www.amazon.com/Celestron-93430-Luminos-Eyepiece-Silver/dp/B005G3P092 But I do not know how the Luminos perform at F/5