I also have too many. With the exception of the first bag on the list, my expectations were to encounter low temps of about 25 to 45 degrees F. In roughly chronological order of accumulation:
Frostline 0 degree, acquired/sewn ~1974. Worked well for conditions expected and encountered in the Sierra in April. Hasn't been used in decades.
No name duck down bag/quilt, mid 1970's, probably about 10 degree, no hood, completely unzips into a rectangle. Still finds regular use for car camping. Acquired to save a little weight and volume vs. the Frostline but probably still too much for the conditions I encountered in the mid 70's till the mid 80's. Guess I was scared of being cold. **
TNF Beeline, about 32 degrees, early 2000's, no zipper (just a coccon). Lost or stolen and I miss it! Probably a little on the cool end of the spectrum for my usage, though. So, what did I do? Purchased another inadequate bag, below.
Kelty Light Year 25, mid 2000's, about 35 degrees (my rating). Not a good choice, still not enough insulation.
WM Ultralite, ~2007, 20 degrees. Warmth problem solved! Reasonably light.
WM Highlite, ~2008, 35 degrees (more like 40 degrees for me). Used in "warmer" conditions.
Katabatic Sawatch, ~2010?, 15 degree quilt. Very nice! At least as warm as the Ultralite with less weight and bulk. The Alsek, not available at that time, would now be a better choice. Or perhaps the Palisade. **
Vaude Featherlight 200, ~2012, 45 degree. Bought on a whim, haven't used it yet.
EE Revelation 30 quilt with one extra ounce of down, 2013. Hasn't seen much use yet. Should be sufficient (with additional clothing) for most of my needs. **
All are down. I haven't owned a synthetic for ages. All have hoods unless marked by **. Wouldn't it be nice to be able to see the end point ahead of time in place of making the incremental steps?