Ajax - Json vs Text Performance

Ajax - Json vs Text Performance

I'm kind of confused and was hoping one of you could give me some clarity.
I am trying to get the best performance out of my Ajax request. The data
coming across the wire is a 1,000 row 10 column table. The debate is:
should I send Json or should I send Text? If I send Json, then doesn't
that mean I have to include the column name for each item? Basically, the
total size of the request will be increased by 10 x 1,000 in text inside
the Json. Or, I can send a CSV across the wire and exclude the column
names, thereby significantly reducing the size of the transfer. This has
its own performance implications though, because then I have to parse the
CSV on the client, rather than having it ready to go in Json. Thoughts
anyone? Thanks