Started with ER6's, went to ER4's, found both way too bright and fatiguing. Moved on to Shure E2's and E3's and was underwhelmed. Tried the E5's but they dug in and create a pressure point in one ear making them painful to wear. Finally splurged on some Westone UM2's 2 1/2 years ago when a sale popped up ($250 shipped.) Couldn't be happier with them, not even tempted buy the new Westone 3's. I tried some custom IEM's but they never fit right so I returned them for a refund. I'd recommend the dual driver Shures or Westones, on a budget the Ultimate Ears super.fi 5 pro sound good (but I don't like the Shrek form factor.)