I have spent 20 years sleeping solo outside and have yet to become satisfied with my tent, hammock, bivy situation. I have tried everything, and actually have nearly everything in my garage, Clark Jungle Hammock (I love it but now that I live in California find that I can't always find a way to string it up) solo tent with a tunnel entrance (difficult to get in and out of) Outdoor Research Advanced Bivy (I love it for Alpine use climbing and mountaineering but its a bit Spartan for cycling, best for really, really cold weather. I used one most of my time in the Army in Afghanistan and it worked flawlessly).
I think my ideal shelter would be a single wall solo tent with a side entrance (certain orthopeadic injury issues make a front entrance tent really difficult). Perhaps a bivy/tent hybrid with a side entrance like the Integral Designs Unishelter would be a good choice. A tent with rain fly would work too, but most interested in keeping weight below 3lbs. Not that concerned about price, as with these sorts of things you get what you pay for, most concerned about finding a final solution to the perfect shelter. I know a lot of people love hammocks, I do too, in my native GA and SC swamps (keeps you away from gators and snakes) they are pretty much the perfect shelter, but in the fairly benign wilderness of the West I am most concerned with ease of entry/exit and stormproofness.
Any suggestions? I would love to hear what others have tried and liked or not liked.