Well, I decided to go with another "heavy duty" Husqvarna Landowner Series, since it's about the same quality as a John Deere X500 costing twice as much. Apparently, a lot of others agree.
I went with this model:
GT52XLS
Husqvarna Riding Lawn Mowers GT52XLS
It's part of the Landowner Series, so everything is thicker and heavy duty. Looking back, I think most of my problems with my old Husqvarna were due to my own inexperience (mowing thick, wet grass until the deck belt snapped) or stupidity (leaving gas in the mower for 6 months, or driving over small piles of thorny mesquite brush). Another example was the rubber washer over the gas tank (under the seat) which gets killed by Father Time and the Texas heat. Once it cracks, it lets water seep in to the gas tank. That problem cost me trouble for MONTHS. So a lot of my perceived "adventure" with this HV mower was really my own doing, or at least not HV's fault.
I also was REALLY BAD about never greasing the mandrel fittings. I bought a grease gun, but had trouble getting it to lock on (and remove itself) so I basically stopped using it. Stupid, I know. Recently I had some trouble with the left-front tire, because it needed grease and was constantly squealing and grinding the inside (bearing?) of the wheel until it needed replacing.
My solution? I bought another new grease gun (my old one, besides being a bit rusty and covered in grease, doesn't work anyhow. Grease comes out everywhere BUT where you try to inject grease!) I don't want to save $35 and manage to ruin a(nother) riding mower tire.
Except for that one glitch where my old mower somehow ran the battery down (and my "hours meter" UP), and the issue with the machine literally falling in two -- maybe I can just bolt the dang thing together pre-emptively, install a fuel-line cutoff for $3, avoid driving over piles of thorny brush, and be all set.
Including 6.75% sales tax and a nice discount off the mower itself, this machine cost me $3515.
The advantage of getting another Husqvarna is that I can use all my old attachments and spare parts ($400 trailer cart, $300 triple bag grass collector) plus two complete spare tires I bought -- not just the tire, but the wheel and everything. The back tires are quite large; I think that spare back tire cost me $150 or more. So if I get a flat, I can just change it out and keep mowing, and fix the tire later.
This one is a Kawasaki 24hp whereas my old one was a 26hp Briggs & Stratton.
I'm pleased with what they've done with HV mowers in the past 8 years. They have a gas pedal/cruise control now instead of an infinite-speed lever on the right side. This one still has the silly "translucent visual gas gauge" under the seat, which doesn't really help you at all, but "oh well".
Apparently my old 2754GLS had the lower end "reinforced" deck, at least low-end for the Landowner Series. My new one has a borderline commercial quality "fabricated" deck.
I could have gone with the SI series, which has a lot more bells & whistles, but I wanted durability, so that's what I bought instead. Thicker frame, cast iron spindles, fabricated deck, etc. I even like the fact it uses standard blades rather than the "tool-less blade replacement system" that some models offered -- I don't know if I trust something like that.
Here is what it feels like when I push the accelerator all the way down on my new GT52XLS:
Star Wars Hyperspace Jump (Extended) - YouTube