Generally speaking, it would be better to sleep at high altitude for several days without descending to a lower altitude, like at the campgrounds in the Bishop Creek area, Whitney Portal, or the one along the Bristlecone Pine road. Sleeping lower in one of the many motels (Google, Google, Google) in Lone Pine and Bishop, and trying to use day hikes to acclimate, will not be enough considering the limited time you have for your trip.
All three of the day hikes you mention go to near 12,000 feet, and will consume a lot of energy. How fit are you? Have you done plenty of hiking in your home area? A one day hike of Mt. Whitney is pretty darn hard. Be ready.
Any of the days hikes will give you a good idea of your level of fitness, and give you a small taste of the pain and misery of going to 14,000+ feet and back in one day....ha ha.
But having said all of the above, drink plenty of water, take pain meds, and as an Austrian guide said to me,"suck it up, Princess!"
