seriously dude, you dont. SFZero 3 and SF3.3 are my 2 all time favourite games and I am also a bit of a Naomi fanboy aswell, Naomi SFZ3 Upper not only look like ass, but plays like ass when compared to the CPS2 version.
if its the extra characters your after, you would be better of grabbing a Dreamcast, and a copy of the PAL version of SFA3 Upper or a backup of the US version of SFA3 that has been patched with the RGB fix.
UK Pal Dreamcast SFA3 > Naomi SFZ3 - but if you can live with awfully jaggy sprits then go Naomi, but IMVHO as a SF and Naomi fan in general, i'd go for the DC version with either the RGB fix or the RGB compatible PAL version