I'm sure this has already been asked but how does the DX50 compare to the DX90 is it worth spending an extra £150 for the DX90. I currenly use an Ipod Classic with an E11 and have done for a past few years. It works but now the Ipod is beginning to go wrong and so i am looking to replace it.
I purchased both and the DX90 is significantly better than the DX50, due to the DX90's far superior amp stage. If you plan to use an external amp with your DAP, the DX50 will be fine, as you would be bypassing the internal amp stage anyway. Personally, I found the DX90's internal amp so good that using an external amp is unnecessary. You also don't have to bother carrying around (and charging) two separate devices. For me, the DX90 is worth every extra penny you pay over the DX50 price (especially at its current sale price on Amazon).
One footnote: My impressions are based on the DX90 running either lurker0's modified stock firmware or headwhacker's Rockbox firmware. The stock iBasso firmware (for both of its players) has always been a mess.