Two comments, fwiw. First, I purchased a 520 in October which was about 6 months after I decided to and about 5 months after I put a deposit (refundable) with a semi-local dealer. (Continued to inquire on availability with dealers in 250 mile radius.) Paid full retail and other normal "fees." Sales guy told me they could've sold it 5 or 6 times during the 24 hours it was on showroom before I picked it up and I'm sure he wasn't exaggerating ... I'd have been one of them if it weren't for me! Second, the 520 has been great, I'm 101% satisfied and pleased. It's a small, basic unit but very nimble and maneuverable with all the essentials (at least, all that I need). Based on what you mention as your needs and interests I believe it would be adequate, if not just about perfect.
On availability (regardless of Honda Pioneer 520 or just about anything else), I'd suggest you take the time to identify and contact dealers within the range you'd be willing to drive to pick up. When I did that last year I got on some waiting lists but never heard back from a single dealer until last week when a guy in Tupelo, Miss called telling me he just got in a 520. (Posted it here.) I expect that 520 sold within a day or two.
Good luck!