Honestly, I don't know what a surinamensis looks like. Every time I see it a fish store, it's usually a geo that they couldn't identify.
Personally I like the RHT and the Pellegrini. The latter is a rare fish and very nice to look at. The RHT are just a classic, under-rated geo, with wonderful coloration. Can't go wrong with either.
Steindy's and Braziliensis's are more aggressive if your into that sort of thing, and are very colorful.
Balzani are gymnogeos and are totally different from the rest of the fish, requiring very different water parameters.
Seriouslyfish.com has great bios on each of these fish if you are looking for more information.