ok i have had a eureka sliver city 30 degree bag for a few years and now its starting to loose its loft and ability to keep me warm. I have a base pack weight of around 13lbs and a tight budget. Im looking for a new sleeping bag.

these are my goals:
weight less than 30oz and low as possible
good quality that wont fail after a year or two of use
money is tight so i would like to aim for around $250 but if need to i might could swing $350
down or synthetic either is fine as long as its warm and light
between 20-30 degrees

I hammock most of the time so im open to an top quilt but i would prefer a sleeping bag for when i sleep on the ground.
I am completely aware of the pros and cons of the two, so i dont want start a quilt vs sleeping bag comment war.

Thank you and I would be very grateful for your intelligent input on bags that you have used and would recommend.