Something to also consider in your budget is lighting for studio fashion work. When you move to LF, you'll need to consider stopping down to f22 for 4x5 and f32-45 for 8x10 to get the necessary DOF.
How many 500W monolights do you currently use for 35mm? (Are these continuous light, or did you mean Ws ?)
I've read several accounts suggesting that 5kWs to 15kWs are what an LF studio would need, which means floor packs.
(I've been investigating doing 8x10 portraits with 800-1600Ws, without expecting to be able to do brightly-lit full body work).
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