Well mrm, you might just be the spark I need. I have put off making a purchase far to long now.
I appreciate all the suggestions and I'm seriously considering Brother Barry's, he's made a compelling case for that cover, it packs so well.
Unfortunately I've waited to long and I might be forced to get something that can be delivered within a week, as I am being forced to leave soon. Push comes to shove and I may end up with my original setup, that being a tarp and a Rube Goldberg of bungees.
Updates will come.
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Update: I decided on the montmil mototek. Free shipping if over $49, so I added the rain suit.

Too bad my credit card is no longer valid. I have to wait for a new one. Such complications...