Though I don't own one in those specific parameters, I agree a 7'6 4wt, middle of the road med/fast action, is probably the overall best compromise, or "jack of all trades" Brookie rod.
I have two Brookie rods currently:
6'11 4wt - LLBean Streamlight - My favorite, but it's a 2 piece.
7'6 3wt - Redington CT - 4 piece, use it for backpacking, long hikes in. Fine for 95% of most normal Brookie fishing, but the Bean beats it performance wise across the board. It struggles if I want to use a small streamer, or if you get a long open pool that requires a long cast it starts to run out of power before the Bean.
Just made a deal on a 7'9 5wt - Orvis Clearwater II. Picking it up next weekend. For fishing small weighted streamers in those holes on Brookie streams that sometimes have a "big" Brown in them. The extra reach and heavier line rating and taper to the rod should help with this.
Edit - I should add...I don't think it's wise (or necessary) to spend a whole lot on a Brookie rod. These things get beat up, and frankly, I think the more they get used, the better they look and the more I like them. A brand new Brookie rod looks out of place...like offroading down a brush lined trail in a shiny, brand new $75k luxury trimmed truck. I paid $100ish for all three of those rods. The Bean and the Redington were new, but on sale, and the Orvis was used. As others have pointed out, you can spend even less than that on a good serviceable Brookie rod.