ZIgis is the same or little modified version of super simply 6dj8 amplifier ( http://www.head-fi.org/t/402067/a-super-simple-6dj8-headphone-amp/285 )
Nothing special. Very simply design just double triode and some lm317 current regulators, just 2-3 condensators on signal path. Very easy to do.
Possible to get some chinese kit with similar circuit which is 65 GBP completely done but with low quality elements. Still thinking about Project Sunrise
but with postage to UK it makes the price something like 240$
DefQon, have you heard Millet's MiniMax? is it worth to buy the kit from beezar.com? How to compare them both. I though Starving Student is a basic amp in Millets offer.