I've owned a few not kept all of them though:
R4 (orignal with spring loader) - still got but modded as spring broke
R4 version 2 (no spring loader) - sold it
R4i Ultra - broke it
R4i-SDHC - still use it (not in my dsi as i updated, doh!)
DSOnei -same as above but at least it may get an update
M3i Zero - coming soon not yet in my posesion (in hopes they get round 1.4)
I also (sort of) own another R4 version 2 - my misses uses it in her DS
R4 (orignal with spring loader) - still got but modded as spring broke
R4 version 2 (no spring loader) - sold it
R4i Ultra - broke it
R4i-SDHC - still use it (not in my dsi as i updated, doh!)
DSOnei -same as above but at least it may get an update
M3i Zero - coming soon not yet in my posesion (in hopes they get round 1.4)
I also (sort of) own another R4 version 2 - my misses uses it in her DS