A few new changes - I contacted CEntrance about trading my DacPort LX for a regular DacPort with the class A amp. I always have to disassemble my portable rig to spring my amp for computer listening with the LX, so I figured I'd go ahead and get the DacPort with the amp. Per CEntrance, the LX is essentially the regular dacport with the volume set at 1 o'clock. CEntrance was extremely accommodating with the trade, even though I'd had the LX for a month or so. That covers computer listening changes, and should work fine with my DT1350's, though I'm not so sure that it will have a low enough volume for my iem's.
For the portable rig, I have a Pico Slim to compare to my TTVJ Slim (Thanks bwarfel!). I like the TTVJ Slim's sound a lot. It is excellent with my DT1350's, but the first volume step is right at, or just above my normal comfortable listening volume with my iem's and ipod touch, unless I use EQu, which has lower output. EQu is a battery hog, though it is an excellent EQ program for the iphone and touch devices. Hence the Pico Slim, which has the best volume control I have ever used for sensitive iem's. The Leckerton UHA-4 comes in at number two for excellent iem volume control.
Alas, the Pico Slim doesn't have the same intangible, ah, musicality? Fun? Soul? that the TTVJ Slim does. The Pico Slim is a great amp, and probably the one I will keep, as it is perfect with my iem's, and quite good with my DT1350's. It is detailed, has a nice punch. It is a bit clinical though. The TTVJ Slim by comparison, has some magic fun factor, warmth and soul that gives just a bit of life to the music, at the expense of a bit of accuracy. As I said, the Pico Slim is a great amp, but I really wish I could afford to keep the TTVJ Slim as well.
Anyone else have the opportunity to compare the two Slims? I'd be curious to hear other's take on these amps. Bottom line, both are really good portable amps. The Pico Slim's volume control is the best I've found for iem's, and that will likely be the deciding factor for me.