Gary - I'd consider Langley or White Mtn as backups for Whitney. The issue with Langley may be the snow level in New Army Pass, especially potential cornices near the top of the Pass. My hunch is that Army Pass (or some call it Old Army Pass) will be impassable (short of technical gear) until well into August.
If you do Langley, climb the scree fields the last mile or so - these are on the far left as you approach it. A more direct approach often entails scrambling/bouldering and can become technical. And, there are lots of peaks in the Cottonwood area, including Cirque.
There's a nice campground at Grandview if you do White Mtn. Bring your own water though, as there's almost none up high. White Mtn is almost a sure thing, so to speak. Do watch out for t-storms, though. Sometimes they don't form on the Sierra, but do come over the Owens Valley and really whack that ridge.
