Bob,
Having had both the TMB Paragon 30mm and the 40mm, these will be fine with an 8" SCT - if you can find one. They occasionally appear on Astromart (where I scored mine) and Cloudynights at reasonable prices.
The 40mm should be very nice and comfortable to use, pin sharp stars to the edge and nice eye relief. The 30mm has much less eye relief, in return you get a wider apparent field of view. Of the two I'd pick the 40mm over the 30.
You could of course pay rather more for a Paragon, Nagler or ES.
With the right eyepiece the images in the Celestron 8" Edge HD should be pretty good to the edge, having tried one before.
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