Get this one:
TF-Pro Salt
No need for any of the add-ons. The meters are fun, but can be problematic with keeping calibrated, and in the end, what comes standard is more than good enough (and more consistently accurate than the meters can be).
The pH part of the kit is a bit subjective, but as long as it registers that you are in the 7's range, it is good enough.
The CYA test gives most people fits the first few times, Read more here:
CYA Testing - Further Reading
tftestkits does sell premixed water with a CYA of 50 in it, so you can use that to judge what you should be seeing when doing the test.
Standard Solutions
The other standard solutions are almost never needed, unless you have big issues with color perception.