You could have definitely gotten a nicer deal if bought used, but that's with all used headphones.
RS-1 scales extremely well with headphone amps, so you have ways to go without needing to upgrade headphones, I personally really loved the Millet MAX with it, was a very nice combination, of course with the PPAv2 (my favorite amp overall), it was very nice too. I would recommend something that has serious current output and especially an amp that favors the mids because it makes the RS-1 sign so beautifully.
EDIT: Wanted to add a little note, oh yeah, you'll love them absolutely, one of the best headphones I've ever heard, just tons of fun to listen to, just close your eyes, bob your head and rock out!