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Dave,
I would look at the GSO Superview line of eyepieces. Note that the 2" GSO superviews perform better than their smaller 1.25" brothers. They are not much more expensive than what you have and infinitely superior in any scope and under all conditions. With an F5 scope you don't really need an eyepiece with a focal length much over 30mm due to the large exit pupil it creates.
What I would do is try and sell your existing 2" 26mm eyepiece (they are very average) , buy a 2" 30mm GSO Superview (about $80 or $90) then look at the 2" barlow that Geoff has directed you to, the GS barlow you are considering is also pretty average. Realistically I think if you spent more money on those 2" Kellner designed GS eyepieces (26mm,32mm and 40mm) you would be taking an enormous step backwards, they are not remotely close to being able to deliver the view quality that your scope is capable of.
CS-John B
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