My first choice would be 400UC (rated no higher than 320 preferably @200) followed by Reala (rated at 50-64).

It may seem odd to some to over expose 2/3 to a full stop, but these two films will have no issue with the 'over exposure' and the resulting neg will have less grain and greater saturation. To me the reality is that most film neg film is about one half to a full stop slower than labeled.