I'd steer clear of the A5 IMT for now. Wait to see if the bugs get worked out. I haven't heard music on the new A5 yet, but Archos has never been known for their sound quality. I have the last generation A5, and the sound quality is mediocre. Video, on the other hand, is outstanding.
I'm never owned an iPod anything, but between these 2 choices, for music, take the Touch. 64GB is plenty of room for 80+ CDs. In fact, depending on the bitrate the CDs are going to be ripped at, it is possible to fit hundreds of CDs worth on a 64GB device.
Is the Ipod Touch 64 capable of storing a cd collection of 82 discs, or should i look at the new Archos 5 160GB ? I also require a player that has stereo bluetooth, which both of the has, i hope ? or, does anyone have any other suggestions ? The comments i'm reading about the Archos makes me want to steer clear of the new Archos 5 I.M.T., for now anyways.