Repotting?

[nagal1]

I recently bought three plants, an oncidium,a cattleya and a brassia.They are in 4 inch pots and two are in spike. The plants are large compared to the size of the pots i.e. the plants are about 12inches tall and filling the pots completely. They definitely look as if they need repotting. Should I leave them until the Spring since two are in spike or should I go ahead and repot them? The flower buds on the cattleya are also looking droopy but I don't know if this is the shock of relocating to my house from the greenhouse where I bought them or whether cattleyas have droopy buds at times. Any info appreciated. I could take a picture but the filesize allowed on this site is smaller than most of my pictures and I can't seem to figure out how to start a pic gallery that we are apparently allowed to have.