I buy almost every cart there is because I like it and can afford it
R4 original...
R4 original clone (works with same software impossible to differ)
R4 Ultra
R4i Ultra
3 different types of R4 Gold
R4 SDHC (r4i-sdhc.com)
R4 SDHC (r4rts.com)
R4i SDHC (r4rts.com)
R4i RTS (r4rts.com)
R4i King LL (r4-king.net)
R4i NDSLL
R4i Avatar
R4 Avatar
Hyper R4i
Hyper R4i Classic
R4 SDHC
R4 DSHC
I may have forgot some of the clones......
The Avatar and R4 King are some funny clones as they include software that normaly is not included, the avatar software includes the avatar rom and the king includes homebrew without giving credit to the authors....