Mowing grass after sunset is an exercise in wadding up damp grass under the deck and depositing clumps in the yard, something I never do because the wadded up grass under the deck promotes corrosion, robs power from the motor and generally makes a mess. Far as I'm concerned, putting lights on any mower is nothing but inane.
Just bought an F2880 with a 72" 3 blade deck used from my Kubota dealer. I'd have like to buy a new one, just cannot afford the 'price of admission' and the JD front mount machines are even more expensive.
Far as seats go, there are many options available, Kubota or aftermarket including air ride bases. If I was to buy a new seat, I'd buy aftermarket from a company like Michigan Seat or K&M. OEM Kubota OEM seats are way overpriced in my view. For a new seat and air ride base, aftermarket, expect to pay around 800 - 1000 for it where a Kubota standard (sweaty butt vinyl seat with no air ride) will be almost as much.
If it was me, I'd buy an aftermarket Cordura seat. Cordura is comfortable on your butt and is very weather resistant. Rural King sells them and they are reasonable as well.
Traded in a 2 oar zero turn and I won't miss it. No more oars and no more punishing ride either.