I have a system that was sold to me as a US system, but I believe it's actually a European system that was converted to NTSC. It boots into Euro country mode by default, and comes with a European power supply. As far as I know, there's no difference between Euro mode and US mode in terms of what you see during gaming.
The system has S-video, stereo RCA, BIOS mod, and a new cart slot. I have the box, but no instructions/paperwork. I'm asking $450 shipped Priority Mail. I also have some US and Jpn carts for sale as well.
Let me know if you're interested, and I'll take pictures of it for you.
edit - A couple details I forgot. Includes one joystick in near mint condition and standard A/V cable (no RF switch). Stereo mod appears to have been mixed up, as the red/white colored jacks are reversed (red, which is normally the right channel, is the left channel, and white is the right channel). One small noticeable scratch on the top of the system, otherwise in near mint condition. No faded logos. Serial no. 021013.
Also edited to correct system price. Sorry.
[ January 20, 2002: Message edited by: thirdkind ]</p>