2" or 1.25" barlow?

I am purchasing a C9.25 SCT and was looking at my eyepiece options. I have had several people recommend I get a 2" diagonal (probably the Williams Optics). I would like to get 2 extra eyepieces and a barlow for now - I will expand my collection later (sticking to 2" eyepieces for the lower power EPs). If I get a 2" diagonal, and a 2" 35-40mm EP, it would seem I would need a 2" barlow to be able to use it with this EP. But, if I also want a 12-15mm 1.25" EP, (and the included 25 or 26mm EP is 1.25" also), do I need a seperate 1.25" barlow, or do some of the 2" barlows have adapters for both (the ones I have looked at on-line don't mention anything about being able to do both)? I know the WO diagonal has an adapter ring so I could use the EP's without the barlow, but it would be nice if I could find a Barlow that would work with all my eyepieces.
Thanks

While 2-inch barlows do not come with 1.25-inch adapters, any 1.25-inch adapter can be used in that 2-inch barlow (or any such standard 2-inch accessory).

The key question is: do you think you'll find yourself *needing* to barlow that big 35-40mm widefield eyepiece?

If that answer is yes, and you *do* want a single barlow/magnifier to handle both 1.25- and 2-inch accessories, then I myself would save up the extra $$ and get the 2-inch 2X Powermate. It won't dramatically shift your focal point (as a big standard barlow can), and it's a superb optic.

However, when I'm viewing at ~100x (which is what you'll have, when 2x barlowing a 40mm eyepiece) -- especially with an equatorially mounted f/10 scope -- I wouldn't feel the need for a wide field of view, anyway. The more economical option might be to simply purchase something like an 18mm Superwide or a 20mm Konig (both 1.25-inchers).

Best wishes.
-Dan