HP5+ should give results recoverable in scanning with something like 5 stops over exposed or 2 stops under exposed, possibly a little more. The colour negative ones have fairly similar latitude, maybe slightly less. Over exposure doesn't "overload" the sensor in the same way as digital; the whole negative gets denser, but with a good scanner a great deal can be recovered right across the scene. Of course you can still lose highlight detail, particularly with a basic scan.
Anyway, like
@Yv says, just pick one and shoot it off. I've done colour ones the past two years, may try b&w this year just because I've started home devving...