Hi,
The reccomended LTA amp is a splendid sounding piece. I had one for a couple of years (which for me is an eternity). The only caveat I have is that it is not very powerful, It puts out about 1W. That may be fine for now, but perhaps not later if you want to upgrade. It also is only single ended.
That happened when I purchased the HiFi Man HE6SE phones. Granted the HE6SE is a beast to drive. I sold the LTA tried a few other amps with much more power. I tried out an Audio Gd & it was it was a fine sounding piece (9 watts into 40 OHMS!) willl drive any headphone out there. Long story short; I wended up with the Violectric VA222. It is an excellent amp with more than enough power for hard to drive 'phones. It also images very well with a very wide sound stage, but is not standard rack size. Retail is about 1,200,00.