Check out this unit, it's $150.00
And it will power the ECM 8000 through USB power.
http://www.tascam.com/details;8,15,70.html
I'm using it now with ECM 8000.
It does a bunch of other stuff too.
Works on Vista, XP and Mac.
I've tried about 4 different brands and this is one of the nicest and cheapest.