Depends where you live and what system it is. JTAG's are for the old 360s, and a RGH is for the Slim (Which I have and was around £300). There both essentially the same. But I can pretty much do anything I want with it, copy all my disc onto it and play though the HDD, download games, emulators etc.
Micro Hall of Famer (2011) WFMF Tag Team of the Year (2007) with JC 1x MS World Wrestling Champion 1x WFMF Hardcore Champion (First WFMF Hardcore Champion) 2x WFMF Tag Team Champion 1x MD Tag Team Champion 1x MD Cruiserweight Champion