Originally Posted by IK_biker

The comfort is purely a personal thing. For me it is a tie, although lots of hammockers (especially those with bad backs) swear that hammocking gives them an order of magnitude of higher comfort. The only discomfort I have experienced sleeping on the ground has been when using closed cell foam pads, as I'm predominantly a side sleeper and these pads play a number on my hips.

I am not sure how it matters to you which hammocks I have.
Here's the list of what's left in my gear closet:
TTT TrailGear Switchback Lighthiker
Butt In A Sling Weight Weenie
DutchWear Half-Wit (which I use the most lately)
A 13-oz full net hammock I made myself
A "tablecloth" DIY hammock I made myself, in which I have full-timed every night home for ~35 months. 2 years ago I switched back to sleeping in a bed.
These go under a HammockGear camo tarp with doors.
I still fail to understand how is this list going to suit you in any way...

The bivy you are considering is very good, breathable, and not waterproof at all. There are many similar ones (some of them - a bit lighter and a bit better) made by the US cottage industry,
As to insulation, I don't use sleeping bags, I use hiking quilts which are indeed lighter as they miss the extra pad-side portion. Having used quilts for the last 12 years, I'm only considering sleeping bag for sub-zero (non-biking) situations.
Don't be fooled about the sleeping pad though. This is the most common mistake rookies make, as they often underestimate the needed R-value for the conditions, and then moan about how their "sleeping bag was too cold". An air pad as you mentioned is a joke, it is sufficient only in extremely warm weather (70°F and above overnight). I use insulated inflatable very lightweight pads (have a few with both down and with synthetic insulation for warmer and colder conditions).