If you hike over Kearsarge Pass, you will never regret it. I thought it was one of the most beautiful parts of the High Sierra. Yeah it’s about 18 extra miles round trip, and another pass, but its’ so worth it. The scenery is a knockout. Onion Valley is lovely, too. I don’t know if they dry up completely, especially with this year’s snow pack, but it was flowing with waterfalls in July '04.
Besides, Independance is a cool little town where you can look up at the High Sierra from a totally different perspective. There’s also a bus to Bishop where you can find a really good outfitter if needed.
Oh, if you’re not cold-acclimated, you might consider adding a liner to your sleeping bag or going a bit lower for the temp. rating.
I’m usually a warm enough sleeper that I can count on one hand the number of times I slept inside my sleeping bag on the entire PCT (or the AT, for that matter). I usually just sleep under it, quily-style instead. When Jeff and I hiked in northern CA last September, though, it was downright COLD for the first few nights until I got used to sleeping outdoors again, and that was at a lower elevation than the Sierra, with a 15° bag and in a warm tent.
Have a great time.
-Chipper
Chipper