The AKG 701 is pretty special with the 650 and 600 you need to get a really good headphone amp to get the best out of them and worth upgrading the leads as well. If you just want a good headphone to go with the IPOD then HD595 is great. My advice with the 650 is try them first they are a bit to laid back for me I actually downgraded from the 600 with Cardas cables and no regrets so make sure you happy with them first