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I use (or did until I got a self guiding camera) an 80mm Nextstar refractor, same as the Short-Tube 80. It has a 400mm focal length, and I use it with the ToUcam, non modified. Scopes that I image with are either 800mm focal length (the Tak), or 1250mm (the newt). At no stage have I found the discrepancy between guidescope focal length and imaging scope focal length to be an issue. One thing I did find however was the need to get decent guidescope rings, and ended up with some DR125 Losmandy ones, well worth the money. This is more the limit of the ToUcam than anything, but worth considering.
Suggestion is to try the 60mm, but be careful with the barlow concept, as it will no doubt make the already dim image more so. Jase may be right about the flexure, and hence the reason for an OAG, so take care with this as well.
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