Huppermage set recommendations 157

I have a huppermage level 157. I'm currently agi/Cha but I've had the same set since about level 100. Eventually I want to move towards Omni/crit. It will be quite some time until I get to 200 so I want to update my set to something better for my level. This is my first character at this level and I'm really overwhelmed with the amount of choices and have a few questions.

Any recommendation for Omni or agi/Cha sets at this level?

Should I be looking to keep full sets or is mixing and matching generally yeild better results at this level?