For 1.5 acres you don't need a big mower
I would pop for the EZ335 or 355 Deere.
One of the few mowers that was actually designed from the ground up rather than tossed together from what ever sub assemblies that can be bought cheap
You notice it when you service them , every thing can be accessed reasonably . all nuts are captive all bolts are the same size & the height adjuster is a wheel brace type spanner to fit them all
If possible fitted with a Kohler it will make servicing it a doddle ( again 2 spanners to strip the entire engine )