If your on a budget or even if not i like str8 edged 4x1 PAR (or similar) with no moulding at all, looks very sharp and clean IMHO (when fitted and painted neatly) and is as cheap as chips.
The other nice look if you can get it is the same thing but in oak which you can leave natural. And because its not moulded it will be comparable in price! but maybe take the thickness down a hair.
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