Ha, if you wanna go back a couple of years it would have been the T-Master lol
These days the T-mag reigns supreme.
seriosly, i had a Echo Hifi and it was reallly reallly heavy, didnt effect my riding though. TI'ing it up won't save much weight, drilling bits and peices will though. I recommend searching for a 'Deng' bike (ZOO!, Adamant, Czar, Echo, GU) off here. There made from U6 aluminium which is strong as houses yet light as a feather. If you want something really light, try looking for a Monty.