Hey Mike - welcome to TBN!
The
L5450 is one of Kubota's best products ever. It is extremely well-built with a very low incidence of problems or weak points. I've had two of them, one with a cab and one without. This model is heavy and strong - the qualities that make a good tractor. The LA1150 is powerful and the
L5450's big hydraulic pump makes it quick too.
Search TBN for keywords
L5450,
L4850,
L4350,
L4150,
L3750 - you'll find lots of stuff to read.
Of those you mentioned, the one with only 465 hours is likely the best value - unless the others have new rubber and extra hydraulics or other options or attachments included. A comparable new Kubota model for weight and power is the
M6040 with hydraulic shuttle - at around $36k. There are not many
L5450's with low hours that come up for sale. If it were me I'd pounce. Good luck and let us know how things turn out.