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I'm no expert, but I'll add my experiences for your evaluation. I've done no OAG, just the guide scope route. I started with 80mm f6 SW guidescope and QHY5, piggy backed and using PHD+EQMOD. Worked well enough for a newbie.
I eventually thought it was all a bit big, clumsy and flexy, so then went the finderguider route with a DSI II mono hanging off the back. Small scope = light weight = less flex, and the DSI has a very sensitive Sony HAD chip, so always tons of stars. Again, PHD+EQmod. I have it mounted in a side by side arrangement so it doesn't need to get disturbed when I change out scopes, from my Newt to SCT to refractor. It's always there ready to guide.
A small benefit is the low cost finderscope allows one to put more $$'s into the camera, as used DSI's are still about QHY5 price. It's a bit more of a DIY'y approach, but compact and functional. Of course, YMMV.
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