There's some great quality mono lines out there today - strong low stretch such as Tortue, Moimoi and Platypus to name a few. If you go for braid, maybe stick with the higher diameter braids such as Berkley fireline which will be more resistent over time on the sand than quality lower diameter braid (not cheap either).
Braid will cast further and assist in sensitivity, but depends on your set up too....e,g, whiting, bream, or heavier, salmon, Jew etc?