Another thought. You may end up with a bunch of spare spools to cover conditions met. One thought is to buy a reasonable priced fly reel so the spare spools are doable even if you don't use them much.
One of my favorite lines is a shooting head. It is 30' of fly line with a pile of backing under it. If on the bank, you'll be amazed at the casting distance attained on those wide tail-outs on the lower Deschutes. If you are in a boat, a shooting head makes it so much easier to pull flys (like Hot-Shotting) through productive runs.
The Deschutes is a wonder of a river; the only place I've been when you can hang over the bow of a raft and almost touch the Steelhead as they part for you to drift on by. I've seen it where there are literately hundreds to be watched. What's worse if when you know they are there, but they won't take anything you are offering. That's when I'd try an all black WoolyBugger tied on a #2 or 4 light wire Mustad (don't think they even make the hook anymore). May still be a workable fly, even if tied on another brand of hook; you may wish to keep it in mind.
I've read the rule of thumb is to use a shooting head that is 2 1/2 to 3 times the length of the rod being used. I must admit that's too technical for me; back when I used them, I believe everyone used a 30 foot head; opinions abound, I'm sure. Shooting heads are available in floating and various sinking versions. I have a floater for shallow tail-outs and a heavy weight sinker for winter fish to get the fly deep quick; haven't used either in at least 10-15 years LOL!
Don't know if the rant helped or hindered your quest for the perfect drift; just thought I'd share the thought.
