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Ron your scope is a 150mm f8 and it is said that the greatest visual acuity is with an ep that gives you a 2mm exit pupil. This corresponds to a 16mm eyepiece. I would try a 15mm for general medium power dso viewing at 80x, barlowed will give 160x or a little more. I doubt a 150mm achromat can be pushed much higher in power without the colour being objectionable.
If you buy a 40mm plossl, make sure its not in 1.25" barrel format or you wont get any wider field than you would with a 32mm plossl. This is why we have 2" format eyepieces to accomodate these larger fields
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