I currently am using a pair of hf5 IEMs from Etymotic Research. They are at the $150 price point and do an amazing job, but I was wondering whether I would greatly benefit from an upgrade. They're a year old and are still pumping out excellent quality audio. The models I was considering were the Ultimate Ears Triple-Fi 10 Pro, and the Westone UM2. Is this overkill? My setup is an un-amped iPod touch Gen.3 and a MacBook. Any recommendations or opinions are appreciated.