Like Orly, I think the main overkill you have there is the guidescope: Its bigger than your imaging scope!
Having said that, what's the total weight of your setup?
I used the Sphinx SXW previously without autoguiding on a VMC200L (!) It did decently although it was hobbled by a very unsteady tripod. It will comfortably handle your setup if you downsize your guidescope or if its particularly light. I think there's 2 on sale at the moment. Do bear in mind its PE is probably somewhere in the 30arcsec range and its not considered one of the "premium" mounts for AP.
Having said that, the short focal length of an 80mm (it's not like an f/10 or f/16 achromat, right?) will forgive a multitude of "sins"
Be aware when buying most other mounts except the Vixens - to the best of m knowledge, they all require modifications or extra parts to reach down to 0 deg latitude. Locally the Skywatcher/Orion mounts will be modified by local vendors but as you can read from previous threads, Orly had to go to great trouble to manufacture his own wedge for the CGEM. Nothing wrong, really, but just be aware
The Losmandy/Astro-physics mounts do have specific adapters you can buy, but for extra cost. So do check the latitude range of the mount before you buy so that you are aware.
Also be aware your Meade 10" is at the limit of the SXW's capacity. I assume you will want to occasionally mount it for visual fun
Bear in mind too that you will need a half-pier or some sort of extension to avoid the counterweight bar from hittng the tripod legs.