after getting my butt hammered for eight days last season on the SHR, and the JMT, I can only tell you that what you think you are capable of doing on the east coast, and what you are probably goint to do in the Sierra's, is probably two very very different things. I lived and climbed extensivley in the East for a few years, and I can compare the west and east easily. I trained very hard, have a lifetime of off trail skills, am an experienced and accomplished mountaineer, and was barely able to make the 14 miles a day avg needed to do the route in 14 days; and was mentally exhausted from the unending routefinding stress. There are NO breaks on the route. It just continues to hit you hour after hour, day after day, and its all at 9-12,000 feet! The route is fantastic, but it is not a two week thru hike except for a truly elite band of individuals. With that said, there is no reason not to take your two weeks, and go do the route and see how far you can go... I'm going back to enjoy the adventure, not to race thru it.
If you want to read my trip report, its at http://www.getlostoffroad.com/uploads/SHR_Trip_Report.pdf
be happy to answer any other questions!