I think that many options would work. The fastpack option seems simple, and would provide adequate protection. A bivy would work if you know how to do that, can stand the confinement, have tried it, and want to spend the $80 min to buy one.
I climbed it twice from the west using a Wetzel tent
http://www.kmart.com/product/index.jsp?p...entPage=family.That worked fine in rain and wind at Guitar Lake. Cheap at $27, available at any K-Mart, need to seal the seams (spray with Scotchguard worked for me), basically a disposible tent.
A bit weightier than I would use now at 4,8....but it gets the job done. Roomy, single wall.