The 164 is really short. Being a rockered ski, the CRJ is going to feel like an even shorter ski. Realistically, it will ski like a 158ish traditional camber ski.
The typical rule of thumb is to size up. 180 & 188 are the top selling sizes for that reason. Remember, the CRJ is a very
soft, fun, playful ski and they are very easy to ski and throw around. Based on your height and what you want to do, I would recommend the 180 or 172 (at the shortest).
Nonetheless, you can't go wrong with 4FRNT. We were just at 4FRNT party last night here in SLC...great crew!