[pct-l] Sleeping bag q

[busywurld at hotmail.com (busy wurld)]

I am planning on doing the pacific crest trail starting at the mexican border in February and finishing at the Canandian border in October.  I also plan on doing alot of backpacking in the pacific northwest.  I am debating on getting a 20 deg F sleeping bag or a 30 deg F sleeping bag.  I plan on using clothing in my sleeping system as well.  Your thoughts?
Sincerely,
j