Best pots and medium for cattleyas

[Cinderella]

Hi,
I have been reading and my head is really swirling. Can a few of you give me some idea what you have found really benefit the cattleya orchids? I need new pots and new medium so if there is a website that you buy from that is good and not get in trouble for advertising, that would be great too.
I currently have 2 cattleyas in grey plastic pots. One is flowering! Then I just bought 2 more that came in dark green 2 inch pots that really need to be repotted. I have noticed that there are a lot of white, clear and opaque looking pots for orchids too. thank you!