Finishing Basement Walls: Drywall Backer Required with Planking ?

I'm tring to decide what to use for my basement walls. I have everything framed up with 2x4's, added insulation and installed a vapor barrier. I'm considering the following options (cheapest options first):
painted drywall paneling over unfinished drywall PGM Wood Products wood planking (directly to the studs) pine or cedar (most likely pine)
I like the idea of wood planking because it's easy to work with and do a little at a time but I've seen some manufacturers don't recommend it be applied directly to studs (and that a drywall backer should be used). Is that really necessary? If I have to have a drywall backer, I think I might just do paneling over it or (if I can't find a paneling I like) or just paint it.
Any feedback you guys can provide would be greatly appreciated!
Thanks, Kevin
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snipped-for-privacy@blah.com wrote:

the reason they recommend drywall behing panelling is to provide a fire separation. in a concrete basement, it probably isn't necessary on the walls, though it seems like a good idea for your basement ceiling.
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The manufacturer of teh planks mentioned the following:
"We recommend that you do not install directly over studs to avoid bowing."
Anyone have experience with this?
Thanks, Kevin
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Just a bump...anyone....anyone?
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snipped-for-privacy@blah.com wrote:

Some mfgs recommend paneling over drywall because of the really cheap and flexi nature of the paneling. If it were me I would just drywall and paint. If fact thats what I'm doing!
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