I buy almost every cart there is because I like it and can afford it
R4 original clone (works with same software impossible to differ)
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)
Hyper R4i Classic
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....