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I go along with the notion that a 2mm exit pupil is best viewing galaxies at a dark site, which translates to a 13.4mm eyepiece. Which in practical terms is either a 13mm or 14mm eyepiece.
On my dob, I wanted a very wide field of view because of the pushing I was doing, whereas on my C8 a normal wide angle sufficed.
There's no need to rush out and buy an expensive new eyepiece. 13mm Naglers show up here or on Ebay every so often. So too does the old Meade 14mm Ultra Wide angle (great eyepiece, rarely expensive, but darn heavy), and so do various other eyepiece brands that have good reviews. Some patience is all that is required.
For high power, the typical recommendation is an eyepiece that delivers a 0.5mm to 1mm exit pupil (3.3mm to 6.7mm eyepieces). So in the first instance, after you get your eyepiece for galaxies, just use it in your 2X Barlow. For 10% higher power, don't put the eyepiece all the way into the Barlow.
Regards,
Renato
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