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As you can see in my sig file I have a number of Pentax eyepieces, all of which are parfocal. It is definitely worthwhile having most of the eyepieces from the same family as it saves a lot of focusing, although I find with the C11 I use the 24 Pan much more than I used to in the F5 8" Newt. The amount of focus change between the Pan and a Pentax is not a lot, so it is not a huge problem, but going from one Pentax to another is just a small tweak of the focus motor.
I must admit, whilst the Pentax eyepieces were excellent in the Newt, they do not appear to be as good in the SCT. Some of this may be due to the larger F number, so whilst the 7 and 10mm used to be the ones used most at F5, they produce much more magnification and are less "useable" in normal conditions. I find I use the 24 and 30 much more, but I am keeping them for when I get a refractor and should use them a lot more again.
So rather than recomending Pentax I would suggest you try some others as well. Hyperion and Stratus are a good family to try if you have a lower budget, Panoptic are a bit more expensive but also great eyepieces. It depends a lot on your budget. I am sure other owners of a 925 will give you lots of valuable suggestions.
As for a diagonal? I find I almost never use the scope visually without one (2" WO dielectric). The eyepiece can find itself in some annoying places (on an EQ) and the diagonal allows you to bring the light out to the side easily, which is very useful for kids. When viewing near the zenith the eyepiece will be very difficult to use on a fork mount.
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