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Hi Renato,
You might find this interesting, that the Pentax series of XW eyepieces are in consistence with the first range which u prefer for a f/5 telescope,
Exit pupil----0.5-----0.7-----1-----1.4-----2-----2.8-----4-----5.6------8
FL------------------3.5-----5------7------10----14-----20----30(28)--40
The eyepieces I have as of now which I use in f/5 or f/6 scopes are 6mm, 10mm, 15mm and 20mm in the high to mid power range. 15 being the most used on dso's(hunting and general observing) followed by the 10mm(observing details) and then the 6. Sometimes I do 2X barlow the 15mm for small plaqnetary nebulae as it has a wider apparent field of view and a longer eyerelief than the 6.
Clear Skies!
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