Eyepieces and barlows will generally work with most scopes. The challenge is how good the image looks around the edge most of the time. Once you get below F5 the edges are harder to correct. 4.9 is close enough.
The wider the AFOV typically the higher the price. The better corrected that wide eyepiece is the more it will cost.
If you are less fussy, good center 75% is good enough, with some distortion at the outer edges, then lower cost eyepieces may be fine for you.
If you want near perfect all the way to the edge and a wider AFOV then you want to buy things like the Meade 5000 UWA, Explore Scientific 68 or 82, Pentax XW, Tele Vue type eyepieces. They will stand up best to the F5 and below scopes. But a basic Plossl will give you a pretty good image too, at a fraction of the cost.
When you get into larger scopes, 12" and above, and you are down in the mid to lower 4.X Focal Ratios then you start talking about coma correctors.
There are Fords and there are Lincolns and there are Ferraris. They will all get you to the supermarket. They just do it a little differently and with a little different experience.
Your budget will determine what you will be driving in your focuser. Always start with the budget. Always!
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