Assuming an unlimited budget, I'd love to get some of the experts on here to chime in.. -- Although the budget is unlimited, the person using these IEM's won't be willing to buy or carry any other accessories other than his iphone 5 (no amp or whatever). Purely the budget is for the IEM'S--- The user LOVES powerful and BASS you can FEEL. He wants to feel like, if listening to Tron soundtrack for example, that he's in the movie theater or even better: he's Tron himself. If he's listening to the Batman soundtrack, he wants to again - feel like he's in the theater, or feel like he's actually batman (don't laugh). He wants the sound to be separated (sound-stage) and very 3D in feeling. Headphones I've considered but would love your input on either these listed below, or general recommendations: JH16's UM Merlin Westone ES5 The issue with this type of purchase is there's no way to try these things. I bought Shure 535's and thought they were terrible. I'm terrified I'll get some custom and be sucked in the hole for something I don't like. I currently own Westone 4R's and preferred the bass within those to the lack of Bass, in my experience, in the UE 900's. I hated the shures. Would love to get the clarity of a UE 900 and the bass of a Bose over ear headphone. Thanks for your input!