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Realistically you'll be able to make most colours work. Some might take more effort in finding furniture, etc that matches so have a think about sofas, art you like, etc before settling 100% on a colour.
If you're only painting walls then repainting isn't that tough if you decide to change your mind. One thing I would say though is go for some tough paint. Stuff that scuffs and marks as soon as you brush against it is a real hassle.
I want to paint my living room calke green or something like that but everyone person I ask for their opinion says it is too dark and to go for a light colour.
On the selling point around sofas.... is that going to deter a buyer when I sell it?
I was thinking about a light colour and then a statement wall but can't see how that would work with picture rails with white above the rail.