My dad bought a
B2320 earlier this year with 60" MMM and FEL for $14,100. This included delivery and 50 hour service. He also purchased across the state line and it saved him money on sales tax. This was by far the best quote he got and I'm not sure why that dealer was so much cheaper, but he did have several inside the building still in the crate.
For what it's worth, his tractor handles the 60" mower well and it is a very nice unit. Not sure if you would need the extra hp, but more never hurts, plus the 2620 has a better loader. I guess the question is....how much are you willing to pay for a little more power. Good luck.