Thanks for the replies!
I'm going to re pot my plant right now. I also have a couple more questions that I forgot to add.

I remember reading that cutting off a part of a salvia plant that starts with an A (I can't remember the name) would make the plant produce a hormone that would make it grow outward, or bushier. It would be great if someone could point that part of the plant out for future reference. I will try to find the post where it was mentioned.
Also, I bought "plant food spikes" (6-12-6) from Miracle-Gro for indoor plants and wanted to know if they would be suitable for salvia. If they are, I will wait a few months before using them because the soil I am going to use for re potting already contains enough food for 4 months.
Edit: I found the name of the plant part, it is called the apical meristem. I found it over at coffeesh0p.com.
Pinching - Pinching is a method to promote bushiness and outward growth in your plants instead of growing too tall. At the tip of each branch, there is a section called the apical meristem. This is where all the new growth comes from and is responsible for regulating a plant hormone called indole-3-acetic acid (IAA). This hormone promotes the growth of the main stem and inhibits sideways growth from nodes along the stem. If this hormone weren’t present in the plant, it would grow outwards instead of upwards, so it follows that if you remove the apical meristem, this hormone will no longer be produced and your plant will bush out instead of grow tall.
When your plant has reached the desired height, cutting off the top of the main stem with a clean sharp pair of scissors will safely stop the plant from growing taller, while maximising leaf output.
Do they mean the part at the very top of the plant which "splits" in half to form two leaves?