Actually, I have owned a Little Dot I+ in the past. At the time, I had moved over to an orthodynamic headphone and had to move towards something with a bit more juice. This next one is coming with 5654 tubes. From the description of their sound, it seems it might be a better starting point, but time will tell. Plus, I don't see myself as becoming a spastic tube roller either.
A pic of the last Little Dot I+ I had (but just never used with Grados):
rca 5654 , killer, cheap
mullard 6am6, my favorite of the ones i had, and affordable
and as i am a bit of a tube roller, i could see myself gettin another LD at some point, the tubes are cheaper than the lyr's tubes