In all honesty Ive been very happy with my 2 cover method:
a Weathershield over a Noah
No, no condensation issues. That said, I can't comment for sure how it holds up over,say outside all day long and never uncovered for the winter, but I suspect it will be ok in the end
Yes, water is kept out unless perhaps under tropical storm + conditions, and I've never had saturation yet
Pricey and over the top, that's for you to say: For now, this seems like the only combination that will work to my satisfaction
For a single cover only, I'd decide between these two
I can no longer recommend any single website to purchase from. I've learned the place i got mine is no longer the lowest priced. It's going to require some googling and shopping around to find it now I guess
My 2 covers were about $260 total