I have the Grand L 5030 HSTC... the prior series tractor... I agree with all that has been said so far. They are not kidding. My tractor has over 630 hours on it. No problems ... well, I did run out of diesel once...trust me, it's not recommended. Kubota reliability is legendary... you will see that people most frequetly discuss what they have done WITH their Kubota, not how they have repaired it.
I can't recommend sufficiently that you spend MUCH time reading current and past posts on TBN... you will get many superb ideas and info about what you are seeking to do. Use the TBN search function... it will lead you to excellent info.
Suggest you learn about and understand the following, which I have and could not do without.
cab
HST
QUICK ATTACH FEL
heavy duty bucket
toothbar
extra rear hydraulic ports
rear platform for tools, hauling stuff
chain hooks on FEL
lots of individual weights for front/rear attachment to balance your load
PATS system
R4 tires.
liquid filled tires
working on a slope
My opinion, the L series is exactly what you need, as is the HST. And, something in the 50-60 HP range is just right, IMHO, for what you have in mind.
Tractors are NOT like cars.... they maintain their value extremely well.. and be aware that it is the ATTACHMENTS that actually you should focus on equally as the tractor itself... the tractor is ONLY an engine... the implements/attachments do ALL the work. Thus, you MUST budget for the needed implements/attachments as well as the tractor itself.
OK... enough of my preaching
Suggest you expand your personal profile...include area of the country you are in, etc...it helps people answer your questions...