The old 52' husky has died

and I don't feel like throwing any more cash at it.
I have 2 acres of lawn minimum (10 acres max if I had the speed to do it) to cut and the old girl took me about 3+ hours just to do that.
I've been looking at the Home Debit/ Lowes 54" entry level John Deere at $3k but I'm afraid it won't be any faster than to old mower. I'm also worried that this is just a cheap chinese LT built for the BigBox stores.
John Deere - D170 26HP V-Twin-ELS Lawn Tractor, Hydrostatic Transmission, 54 Cutting Deck - D170 BG20604 - Home Depot Canada
I have no clue what to look for with the zero turn mowers, if I could I'd buy a commercial unit, but I don't have the budget for it.
I have an ATV to do my plowing and utility trailer duties, so it's mostly just grass cutting.
$5k is about my budget max, I don't want to finance. Doesn't have to be brand new, but I don't really know what to look for other than the basics.
What do you like, suggest and/or use for a good LT in my price range?