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Forget using the Mak for guiding... its got a moving mirror, and will wreak havoc during exposures... the 80x500 achromatic refractor is the way to go for guiding...
The mak's longer focal ratio will make finding a guide star more difficult, as the same star will look much dimmer through the Mak than the refractor...
In my opinion, go the refractor for sure!
What guide camera are you using? have you considered off axis guiders?
Orion make a good OAG for $209.. That way you only have one scope on the mount, no possibility of flexture, guiding at the same focal length as imaging etc.. Provided your guide camera is sensitive enough, that would be the best way to go in most situations...
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