Wow, you carry around 150GB of music? The biggest Zune I know of is only 120GB....Archos makes some stuff, but I can't vouch for them.

Remember, pretty much all large capacity media devices contain mechanical hard drives, which are going to be prone to failure- particularly when you're toting them around on various activities. I suppose you probably have your reasons for not using smaller capacity devices and just swapping out your songs more often?