In reply to Blizzard: PHD Hispar 500 which is -10c (not the "900 down" version which is they say -15c) which was OK for lodges in November which will be a bit colder than spring.
If your PHD is light enough and has a full length zip then why not use it unzipped if too warm instead of buying a new one?
I have done a few treks with a -25c bag which I kept unzipped for most of time below 4000m.
Bags bought in KTM will be a lot heavier and bulkier since the down will be nothing like as good as the PHD ones.