Being a newer member I don't know how much I can contribute but here goes. I was sort of in the same boat as you, I have a couple larger tractors and a smaller one. I will have to say I was a little tired of trying to use 2-3 tractors to do a job because 1 was to big, 1 was to small etc.. I finally bought a NH TC40DA to bridge the gap and could not be happier. I am not gonna turn this into a NH commercial, but I can offer my experiences with it. It mows better than our TO 20 Ferguson with the extra HP and it feels more nimble and just as stable, the impact to the lawn is the same if I remove the rear weights and the bucket from the FEL. It uses the rear BB, blade, bush hog and 6' snowblower better than the AC WD45 due to the live Hyd. and hydro trans, the 4x4, power steering and creature comforts make it more precise and comfy to use for longer periods of time, and it will outwork it. The FEL is wonderful and I use it more than I thought I would. Our big gun a JD 720 will outpull it and outwork it, but it uses more fuel, is less precise since it is larger and takes more room and is harder to see things up close when you run it, it also wont tuck in the garage.
So, my TC40 has pretty much become my main tractor of choice, I yank big heavy stuff with the JD, I use the TO20 for smaller lawn tractor stuff (pulling smaller trailers, dressing the drive with a landscape rake after a BB session with the NH....two operators at the same time) and I sold the AC since the NH does everything better.
Lastly ease of use, My wife feels at ease running the NH (she never ever got near the others) leaving me to do other things while she "Works" with the NH. Oh yeah, Dealer Dealer Dealer. I bought the TC because the dealer was absolutly bend over backwards helpful with purchasing, delivery, support, maintanance etc...The Kubota dealer simply was awful, and the JD dealer left me on the lot looking for 35 minutes before anybody even came out to shake hands and start the lying. (I even arrived in my Turbo diesel and empty flatbed trailer!!!)
Since you have a big tractor allready, I would encourage you to narrow the field down to what your local dealer has to offer, shop the features etc and figure out what is important feature wise and then size up how the dealer treats you, then shoot for the best price you can with the dealer you like. A smaller "big" tractor like what you are looking for really does a very nice job at doing everything pretty well, and I dont even think about the pricetag when I climb on it, I just enjoy it. So try em all, I am happy with my NH, but they all make good ones.