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Cameron,
If I'm not mistaken the Skywatcher 150mm is f/12, which means the upper practical limit for magnification is 225X (1.5 the aperture, in mm) and the lowest useful focal length (6mm exit pupil) is 48mm.
Eyepiece FL vs magnification
4mm : 450X - way too high
6mm : 300X - still too high
8mm : 225X - practical upper limit, you should see diffraction rings easily around bright stars.
10mm: 180X - good for high power on DSO's, you should just begin to discern teh diffraction patter round stars. Ideal for planets.
13mm: 135X - optimal in average seeing
17mm: 106X
22mm: 82X
28mm: 64X - good, worth trying
36mm: 50X - good low power, probably the lowest for your scope
42mm: 43X - unlikely to fill the field of a big 2" eyepiece (vignetting)
50mm: 36X - unlikely to fill the field of a big 2" eyepiece (vignetting)
Regarding eyepiece sets, a set of Edmund RKE's would work well with that scope covering 8-28mm in 1.25" barrels though their apparent FoV is smaller than the Hyperions.'
My other scope is an Intes M703 (180mm f/10), but the Skywatcher is the one that is used most.
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