The RCBS reloading kit is often suggested, and has good equipment, but not "the best", even among available RCBS equipment.
For instance, the powder measure is neither their quick-change version, nor their competition version, and upgrading it to QC costs almost as much as a whole new QC PM set. The hand primer is their older version, which can be upgraded to use the new square tray, but it still lacks the universal shell holder jaws, meaning you have to swap your shell holder between your press and the hand primer, or buy another one just for it.
The Rockchucker press itself, legendary in quality, is surpassed by other single stage presses today, for either more money (Redding Big Boss II & Ultramag or Forster Co-ax) and less (Lee Classic Cast). The RC's most glaring shortcoming is it's inability to capture spent primers effectively.
Instead, I would go with the Lee Challenger Breech lock kit. It is a lot less money, is good enough for you to use to find out what/if you like about it and reloading in general. With either RCBS or Lee, you will likely end up upgrading some or all of the equipment anyway, so spend less up front, and have more money left to upgrade once you find out what features you like/dislike most.
The most common failure point on the old challenger press was the toggle linkage, which has been completely replaced and upgraded in the new breech lock version. It is a fine press and will always come in handy whether you upgrade to a better single stage or to a progressive press.
Another route might be to get the Lee Classic Turret reloading kit.
Andy