why not buy a robot auto mower?
i have used it two years, when you drinking, he is working.
here is my auto mower, which is bought from china.

http://www.esaleschina.com/wholesale/auto-mower/

Here is a link that might be useful: auto mower

ignore the spambot above. the LT180 is a different class of machine than any others you listed and would be MY first choice. the only advantage the Craftsman or LA machiens have are warranty. the L130 is probably due for some major maintenance before long, such as tranny oil change and likely a new front axle(mine has broken 2x at roughly 250 hours each time).

If ya don't know how to fix 'em---buy a new one that you can afford! Do not buy a used one, if you aren't mechanically educated, or inclined! And, buy the Warranty, too. Will save time, trouble, and money in the future. A good service plan is worth it, too!
Rusty Jones, the Voice of Experience!