Yea,
www.take2.co.za is your best bet ..good prices and quick. BTGames got a severly limited collection, rather check out Reggies & Toys'R'Us they seem to have "slightly" more stuff on their shelves....but for all latest stuff forget them, take2 all the way.
My favorites at this stage [in no particular order]
Metroid Prime : Hunters (get this if you want to see what the DS "can" do . It's a FPS, more mature type of game...targeting with a stylus makes a massive diff).
42 All time Classics (Best value for money you'll ever get, it's basically all the card games [blackjack/solitaire etc] ,boardgames [chess and such] and some other games like darts and pool in one package! )
PuzzleQuest : Challenge of the Warlord (RPG but all fighting is in the form of a puzzle game....if you ever played something like Magic:The Gathering and combine that with RPG ..this is almost like that)
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These games i don't have YET, but i recommend them anyway:
Advance Wars: Dual Strike [Strategy Game]
Legend of Zelda : Phantom HourGlass [RPG, coming soon!]
I have the "regular" Nintendo stuff too, like New Mario Bros ...also great fun, but can get frustrating [i get annoyed at games not allowing me to save often enough..i mean i am on a handheld afterall [i.o.w i don't usually play 2 hour stretches] ] .