My experience with sport drinks (Gatorade, Powerade, etc.) is that they contribute to high-altitude nausea if used in excess.
As a general rule of thumb, drink about three times as much plain water as you do the sport drinks. You lose a lot more water than electrolytes and while some 'lyte replenishment is important, there is no sense in exacerbating any nausea you may feel by overdoing it on the sport drinks.
And, from personal experience, although my stomach secretions may be more acidic than orange juice, it doesn't sit well if I drink much of it. Remember that your stomach acid is secreted in fairly small amounts and is diluted by food and consumed by the process of breaking it down in your stomach.