$4500 combined? Or each?

Combined that's a bit high but not horrible. You'd still need an ATU and harnesses and bracket if in an older machine. And either an ag express or JD greenstar ready harness(es). That's assuming these older machines don't have any of that in them yet. 

They are both the oldest things in their line ups that JD supports. I'm not a huge fan of 2600 but if just steering it's ok. 3000s are still nice for what they are and quite a lot cheaper than 2 years ago 

If you shopped around you could probably get a 2600 with AT and a 3000 for.....$3500-4k but condition is something. Screens can become an issue on the 2600 (but can be replaced)