I've got a couple modded xboxes. Here are the specs:

Xbox v. 1.4
Mod Chip: Xecuter 2.3b lite

Hard Drive: 160GB, 7200RPM, 2MB

Case: Original
Controller: Standard Xbox

Flashed with the latest Xecuter Bios
Using the EvolutionX dashboard

Price: $400 (includeds shipping and everything else)

Located in Ann Arbor, MI
Contact: xbox-modder@epic-technologies.com