I don't believe there is something that's comfortable from freezing to 90F. If it's good in the cold and waterproof, it's going to be the suck in heat. Vents help, but only so much. From the bottom up- I don't wear motor specific boots. I wear Danner Acadia boots. Desert, goretex only, or goretex insulated depending upon the trip and the season. When it's moderate and rainy, I wear Frogg Toggs Horny Toadz rain pants. Breathable, and lined. For cold weather, really cold, including wet, I wear First Gear HT overpants (a best buy). They are waterproof, well designed, and have a removable insulated liner. Both the Toggs and the HT's are designed so they're easily donnable or doffable over boots. The Toggs only last a season or two for me. The HT's are sturdier. I have too many jackets to mention. My go-to all weather (as long as it's not hot) is whatever sedici is calling their current all weather riding jacket (right now it's the rapido, on sale at Cycle Gear). Well vented, well designed, and with a removable full insulated liner. Order one size up. I wear a Hein Gericke Yamaha factory jacket when it's really cold, because it's big, bulky, and has a really warm liner. Police motor leather in spring and fall. The other jackets are all essentially rain shells, worn when it's warm and I only want rain/spray protection. To echo Hud and others above, Cycle Gear has some good gear, and some bad gear. All covered with a great warranty, and all available to inspect at their brick and mortar stores. Stopping in the rain to put on rain gear is a bad plan A. You'll be wet before you get your gear on. Quality rainproof gear with venting is what you want. That said- when it's hot, I don't usually wear waterproof gear. Vents or not, I refuse to stew in my gear. For a cross country trip as you mention, I'd load up my HT overpants with the liner stowed, the Sedici Rapido with the liner stowed, and rock on, using the insulated liners when I got to colder climes. I'll watch the websites all year and buy stuff when it's discounted when I have the luxury.
There will always be an element of personal preference. My motor leather ends at the waist, but all my other jackets, rain and general purpose, are touring length, going to the hips rather than ending at the waist. Partly because it keeps me warmer and dryer when I need it, partly because they don't hang up or ride up over my waist worn equipment, which I generally like to keep private when I'm off work unless I need to show someone the love of the baby jesus in my pretty green eyes.