Lots of good advice here, although only you can decide which path is best for you, Wes.
FWIW, I shoot both 4x5 and 8x10, along with 35mm and some 120. The bulk and weight of the 8x10, however, can be daunting for some. Personally, I have a back problem, so I have to be careful when hauling the 8x10 too far from the vehicle. I also agree that the experience between the two formats is somewhat different. The 4x5 format is (relatively) quick and easy compared to 8x10. BUT, seeing the 8x10 ground glass image is a "Wow!" sort of experience.
I also have a 4x5 reducing back for the 8x10, but the added depth does limit which lenses I can use on that combination. I use a double-extension Tachihara (which I like for the price), and a homemade 4x5 reducing back. The added depth of the back, and the minimum bellows extension of the Tachi doesn't allow me to use a lens shorter than about 150mm without going to a recessed lens board.
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