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Saturn for it's import library alone.. then Genesis followed very closely by Dreamcast.

Saturn has long been my favorite. Many of the games for it were hugely influential on me (Panzer Dragoon, NiGHTS) and the large import library make it possible for me to still find fun games I've never played before.

The high-end 2D games are obviously a major reason for my continued love of that console. I can play arcade-perfect ports of old shoot-'em-ups or play classic-style games enhanced from cartridge games with things like voice acting, CD-quality sound, and FMV clips.

Mega Drive/Genesis Model 1.

Obviously the Dreamcast. It brings back my memories of being 4 and 5 years old and I will never forget the orange triangle!