Which tractor to buy?

I've got a ~12 acre mountain property in Eastern TN. The majority of what I need is for light gravel hauling, maintaining a ~1/4 mile gravel driveway and keeping ditches and culverts cleaned out. I rented a Kubota B series which worked well, but I'm wondering if I could get away with a smaller BX series Kubota or JD 1025r, or if I should just go with a B series or 2025 JD? The main concern I have is there is one part of the driveway that is STEEP. The B Series handled it like a champ hauling bucketloads of gravel...not sure how the smaller tractors would handle it? I've got Kubota and JD dealers local to me where I live (WNC), but the tractor would live in E TN. Opinions? Thanks!