I have been trying to sail my tractor buying chore on the final down wind leg. In so much as I would like to get the most for my $, having the best equipment available is also a factor. My most recent setback....I have just learned that an additional $1500 is required to add a top & lift kit (Min. 2 hydraulic valve setup) on a L4310 or L4610, in order to get set up with a hydraulic top link? In comparison, the NH45D needs a $300 hydraulic top link cylinder? Is this correct? I really want the Kubota!!