I will post both alongside each other for my review. You got it.
As for Studio VS RXIII, there is NO comparison, even early batches. The Studio is one of the hissiest players ever made, only beaten by HiSound stuff. Bar none, HiSound stuff is the loudest, noisiest player brand on the market. Even old Sony Walkman audio players that I have decried since 2004 are in no way comparable. The RXIII has some hiss, yes, but it is more akin to the hiss of an iPod nano 1G, maybe just a few dB louder.
Sounds good. Hiss would be the deal breaker for me. Especially when it comes to amps it must have a black background. I've made a compromise with the Studio V3rd ANV but could not do so on an amp. I agree with you on the portability factor. I definitely don't intend on using the L3 while out and about. It is strictly gonna be for my desktop or if I'm gonna be stationary for a long while I'll keep it on hand. Would probably set the Guinness would record for largest trousers if I was to intend on pocketing it :P. Unfortunately I'll have to wait for a proper charger for the L3. Also really looking forward to getting a good PSU to get the full potential out of the amp. Do you think you could post a picture of the MKIII along side the DX100? I thought it was quite a large amp still (compared to UHA6 MKII etc).