An EQ6 is sufficient for carrying an 8" scope and guiding quite happily. What will matter most is getting very good polar alignment...your mount needs to track well with only minor corrections by the guider. Guiding is not a substitute for sloppy polar alignment.
A "decent rig" may give you better engineering and look prettier, but when it comes to the crunch, if you look across the imaging field at a star party you'll see everyone - regardless of mount - is guiding. There is no perfect mount. All the extra money buys you is a -chance- at better mechanical tracking in the first place.
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