Currently I have those listed below, but over the years I have owned and sold some cool LE systems like the Panasonic Q Gamecube, the Tales of Symphonia GameCube, the Hello Kitty Dreamcast, and others. I always buy LE systems when I can because the resale value is almost always automatically higher. When there is a limited edition PS4 that doesn't cost an arm and a leg and that doesn't just have a custom hdd cover, I'll probably buy one of those.
Current systems:
-Cherry-blossom pink Japanese PS2. It is just a color difference, but it was limited and is BEAUTIFUL!
-Xbox 360 E Blue Japanese Limited Edition. Also just a color difference, but limited, and only sold by Amazon in Japan.
-VSaturn - Victor-branded Japanese Sega Saturn.
-White Saturn - Color difference only and actually more common than the gray Japanese Saturn.
-Mountain Dew Xbox - Fairly hideous. But only 5000 were made and I got it super cheap. The Hulk version is cooler and rarer.
-Crystal Xbox - Canada exclusive.
The coolest LE is probably the Star Wars Xbox 360. The R2-D2 sounds when the system is turned on is the icing on the cake.