Hi all- IMHO. I agree on 5th gen ipod touch vs ipod 5. I had a iphone 5 and 5s before migrating to ipod touch 5th gen (spook Thanks!). For me, the primary reason to look at an amp is not power but to go balanced. I can promise you that a balanced setup will blow you away. The RSA balanced amp with Ted Allen's silver calbes took the performance of my 846's up (subjectively) 40-50%. It is no small difference. In fact, it makes the iphone 5 to ipod touch 5th gen look miniscule IMHO. YMMV. Good luck!
I ended up going with a Pico Slim and the SE silver cable from Ted Allen. I bought the amp mainly to make fine volume adjustment easier than on the iPod touch. I also found Ted's cable to improve the sq. and it is a very well built cable.
I don't find much of a difference on my home setup between balanced out and SE out, aside from the 6db increase in volume. I found the bigger difference on my home setup was when I added the balanced XLR cables from my dac to my amp. I am now wondering if I am missing out since I didn't order the balanced RSA with the balanced cable for my SE-846's, but it is too late now as I don't plan on changing.