Yeah, because none of them are Space Invaders Extreme 2, which is far better than any version of the original.
(For the record, though, the DS version of SIE is the best version. When the game was ported to the PSP, they had to change a lot of stuff that was designed for a dual-screen vertical layout to work on a widescreen horizontal layout, which screwed stuff up enough, but then Backbone went and did a crap job porting that for XBLA. Also, the DS version had the proper Zuntata soundtrack composed specifically for the game; the other versions had a generic techno soundtrack, which kind of defeats the purpose when the music is affected by the gameplay.)