Been lurking here for a while, reading advice on DAPs and such. My current rig is a DX90 with Shure ES535 IEMs which I like very much, but sometimes my ears become fatigued (perhaps custom molded inserts would help this). I would like to augment this with a pair of $300ish over the ear, closed ear (noise abatement is important in my environment) headphones that have a good neutral sound to go with the DX90, mostly listening to rock (Rush, Van Halen, Tesla, etc), pop (Sting, Police, MercyMe) , some country and bluegrass (Bela Fleck, Lady Antebellum, etc). Also, any advice on a portable amp that would match all of the above if possible. Amp wise, I cannot go much over $150-200 so nothing super extravagant. Any ideas? Thanks!