How do I choose a Vanda basket size?

[snappyguy]

I recently purchased a Vanda that is about 16 inches tall, 24 inches wide, with 24 inch roots. It is in a 4 inch basket plastic basket currently. How do I know what size basket it should be in? This is a plastic basket so does it ever really need to be put in another basket as this basket won't deteriorate the same way a teak or cedar one will over time? Thanks for the help.