I have had a John Deere L111 with the V-twin engine for 5 years. Other than sharpening the blades, changing the oil and filters (fuel, too), and lubing the front axles, etc. I have had no problems.
I believe the current model that replaces it is the L-115, but that is only a single cylinder now and is about $1700 at Home Depot.
If you want a JD, go for the V-twin. I think Home Depot has them for about $1900. Wait a little longer and you will probablly see the prices drop.