You've provided not nearly enough info.
Presumably for a B4?
Racing or bashing?
Motor?
As most 2WD's will only use at most 1500mah for a 5 min race the capacity is almost irrelevant other than to get a "c" rating from.
Personally I'd go for around 4000mah with a 30c rating. Much more and your thumbs won't be able to keep up!
If you go higher capacity a lower c rating will produce the same power and vise versa for lower capacity - in theory my old gold trakpower 4900 25c sticks are similar power to my new 4200 30c speedpower saddle packs.
Hopefully I've helped a little..
edit: the ones in your link will be stupidly fast - I know I couldn't justify that much power in a 2wd!
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