How many different potting mixes do I need?

[plantluvver]

I have not repotted any of my orchids, and I need to start doing that. Right now, I have a one gallon Cymbidium trying to burst it's pot, an overgrown Oncidium that needs to move up and an Odontocidium these two are in 3 or 4 inch pots right now.

I am assuming that it is much cheaper to buy local ingredients and make up my own mix than to buy mix mail order.

I also have a few Phals.

To complicate things, I just bought a blooming Paph., Miltononopsis, and Goodlera. I haven't even looked to see what they are planted in.

I am hoping to attend a local orchid society meeting soon, but I am thinking I want to repot as soon as possible, because I want the plant to adjust before it becomes cold out. \

I think I read that spring is the normal time for repotting, but I don't think I should let these wait until spring. I will try to take some pics tomorrow in the daylight.