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1st thing to note is that an OAG does use up some of your back-focus so before you go down that road, be aware of how much you have on your setup. Different brands have different back-focus demands.
The brands I have used are Lumicon, Celestron Radial and Orion Deluxe. Atik also make one that look good and seems to have a very small backfocus. Of the 3 I have used, the first I eliminate is the Lumicon - too much backfocus and no radial capability. The other 2 both have radial capability but the Celestron one is primarily designed for an SCT (I modd'd it to suit a newtonian but it wasn't a great success) and the last OAG standing is the Orion but it looks to me as though the Atik is worth a look as well.
The webcam should be dedicated if only to get an on-board ST4 port to plug straight into your mount - fewer cables back to the computer = less clutter. The choices are basically between Orion and QHY5 - I use the latter and have found them excellent value and performers. I was turned off the Orion version because of cost but uderstand they are essentially the same camera in different livery anyway.
I am not using an OAG at the moment having found them just a bit too fiddly. I prefer the flexibility of a stand-alone guide scope.
Hope that helps.
Peter.
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