Not to be funny, but the answer depends on what look you are trying to achieve. I have a friend who is modelling D&RGW in On30 and is using 36" radius curves, which works fine as long as you don't go bigger than an MMI K-27.
I've seen other layouts using Bachmann Porters and mining cars that look fine on 18" radius curves. IMHO, the smaller the curves the more whimsical and less prototypic it looks. I'm personally using 42" minimum, but space is not limited and I'm running big narrow gauge power and full length passenger cars.
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