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Some Random thoughts....
Losmandy rings and mounts are $$$ - if you are on a budget have you looked at an alternate like ADM?
You do not mention your cameras, in my experiance the guidecamera resolution and sensitivity and the software you are going to use are just as important as the guidescope.
If you want to use your guidescope as a widefield imaging scope it had better be an APO. For the $$$ it seems impossible to beat the ED80 types.
And this raises the next point - the ED80 is in a 100mm tube so it is quite big and heavy compared to the wo66 I use for example - main reason for me in choosing the smaller scope - load carrying capacity of the mount - it also serves duty as a grab and go scope for holidays.
Finally you do not need to go to f15 on the guidescope, if you are autoguiding that is, sub-pixel guiding at +/-0.2 pixels or better is achieveable so assuming the pixel sizes in the imager and guider are similar you can use 1/5 of the fl of your main scope...400mm in your case.
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