For galaxy season next year, I am considering to buy a used C8 XLT but also open to buying a new or used Edge HD 8. The thing is, since I am imaging with a 533MC pro and with possible future plans to upgrade to either a micro 4/3 or APSC sensor, will the field curvature of the non-edge be a major impediment? The edge HD8 is going for around $1599 brand new, and considering that I need to get the reducer AND possibly a OAG plus guide camera, the cost quickly rises. if I buy the C8, I can possibly get all of that and stay under $1599 total.
Would love to hear your thoughts on this. Or should I (gasp!) get a refractor like the Astrotech 115EDT instead?