What mower decks are included with each? Most of those models have several choices. If that's a quote for each with the 48C deck, I believe that represents a small discount off of MSRP - not always that easy to get on the small Deeres.
It's your money so of course it's easy for us to spend it. The LX is Deere's top-of-the-line lawn tractor - a higher level machine than the others you list - lots of detail differences for the better. But it's a lot of money. It's also so easy to get into price creep - for just a *little* more than the LX - you can get a GT, the beginning of the 'garden tractor' lines. The GT series is identical to the LX in the operator controls and features, and is very similar to the LX under the covers - but has bigger tires and if anything is a tiny bit heavier duty. But now the price creeps up a little more.
The G110 is the heaviest duty "L" so to speak, and shares most of the build details with the L series, not up to the level of the more premium lines.
Don't forget - Deere still has their 30-day "At-Home Trial". If you pick one machine, get it home and decide you made a mistake - you can take it back within 30 days for a full refund or full trade on the model you wished you had gotten. Hard to go too far wrong.