Thought you may be interested in this Chinese product which is new to the UK and distributed by Kronos Hi Fi, Dungannon, N Ireland. I auditioned this recently and it is truly amazing value - including a pair of small Sienns in the price.
The product spec is as follows;
A valve headphone amplifier using 2 x 6N1 valves and 1 x 6E2 valve this unit features one line stage input and a USB port. It is also a valve hybrid integrated amplifier offering thirteen watts per channel. It retailes at the same price as an X-Cans V3.