Jas you sure move quick!
I wouldn't buy the focuser you linked to. From what I have read it isn't that good. Much better to get a Feather Touch, Moonlite or a Baader Steel Track.
If I were you I'd read the threads on dobs and bino's on CN binoviewer forum. There is a lot to read…a whole lot. It seems that dobs that are solid tube or fixed UTA need some type of OCS, my 10" Newt does.
Look at the useful links on the BV CN forum too, there is a lot of info on the different types of binoviewers and what eyepieces vignette etc etc etc
So if you get the Andrews bino's, get a pair of GSO 25mm plossls, good and cheap and will give the max TFOV with this bino, and if you don't have a 2x 1.25" barlow get the GSO one…good and cheap
Keep your focuser!
That'll get you started for under $200. The barlow nose piece can be taken off and screwed onto the nose piece of the bino's for a little less magnification.
You won't need a Coma Corrector with bino's either.
It's not high end stuff but should work.
Matt