I'd seriously look into something else like at least the Edge DS, DSTT, etc. for cheap cards or maybe the SCDS1 SDHC or Cyclo DS Evolution for better cards.
Actually since your flag is Australia, you'll probably get a pretty good deal(and faster shipping) at OzModChips.com (IIRC - owner posts here occasionally in the Cyclo sub-forum) and he carries the Evolution, but I'm not sure what the other two slot-1 carts that he carried were. [EDIT] Checked, for slot-1 he has Edge DS, Acekard 2(new), Cyclo DS Evolution, and the M3 DS Reals(I'd skip these). [/EDIT]
The EZ-Flash V and N-cards are pretty outdated, along with the R4 DS and M3 Simply. Also it sounds like the latest shells of the M3 Real don't have the pin guides and MAY have shorted out some peoples' DSes. (Probably blew their fuses, but that would require sending the DS to Nintendo for replacement, unless you are able to fix it yourself...)
Also beware of the N5, E7 (IIRC) and some of the other R4 DS clones that have come out recently. They're just as outdated as the R4 and reports say that they have a much lower build quality to boot.