[argyllcms] What colorchart I should buy?

Hi all, first of all Happy New Year!
I just take a look into colorcharts to profile my DSLR camera, and I found that Colorchecker SG from X-Rite it's one of the most popular.
Reading  around  I discovered that Xrite doesn't provide the reference file for that chart..
In "ref" dir of Argyll I found it but I think it doesn't came from Xrite directly but it's a user contribution right?

I should consider buy that chart or some one else?
Free to give me suggestion :)

Regards,
Davide
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