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Unless I'm mistaken the Celestron 8SE would come standard with a 1.25" visual back and 1.25" diagonal and perhaps one or two 1.25" eyepieces (maybe 25mm & 10mm). With this configuration you will only be able to use 1.25" eyepieces. The maximum field you will get with 1.25" is with a 32mm Plossl or 24mm Panoptic, both of which have a 27mm field stop diameter and will give you 0.77deg TFOV.
You can change the 1.25" visual back to a 2" version and add a 2" star diagonal and you can then use 2" eyepieces. A 35mm Panoptic would be a good choice and will give you 1.1deg. (A 41mm Panoptic is useable but you will get slight vignetting due to the opening at the rear of the SCT (visual back) alhough it may not be noticeable.
Note you could also use a f6.3 focal reducer and stay with 1.25". The reducer screws on first and then the visual back.
Stay with what the 'scope comes with for a while as you can always change and add to it later as the SCT is very versitile.
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