Avoid the sr. They are absolutely amazing once set up. The journey there can be a nightmare. Mine is finally set, and it still requires a brand new battery every time I play or I get bad chopping issues. They absolutely scream when done but not for the casual user. Trilogy autocockers are great for casual users. That price is high, but it does come with everything you need to get started. They run on co2 but I wouldn't recommend it. If you do run on co2 make sure to have a shop install an anti-syphon tube (key word SHOP) and don't get too trigger happy with it. It will freeze it up. Offer the guy 100 for the gun tank hopper and mask. She will shoot good and be much less picky than a traditional cocker.
Autocockers are not more accurate, I'm just more accurate when I shoot autocockers.