A 40 HP L series (with Top-N-Tilt) and a front end loader plus a 6 to 7' box blade on the back would be my go-to configuration.
You can drag a fair amount of fill in the BB while you carry a bucket full in the FEL.
A good quality, medium to heavy duty BB will give you a lot of the
ballast needed for safe operation with those heavy FEL loads.
The BB will let you smooth & contour on your way back to the pile.
For what it can do and what it weighs, the BB is a really good value for what you aim to do.
When you're all done, resale should be pretty close to what you'd pay for it (if well maintained & used by yourself & previous owner).
It's hard to break a box blade ... although I'm sure someone on TBN has managed to do it.
If storage is a problem, a ShelterLogic type of shed should protect your investment until it's time to sell for an additional 10% or so.