Well, one 'minor disenter' here... :>)

If your going to use a one hander, I'd have 2 rods, both 10 foot in a 6 and an 8. If you want to get into Spey Rods, the first should be a 13-6 or 14 foot rod for 8 or 9 wt lines.

(Side Bar: I've got 14 spey rods now and the 'King of the Hill' is a 7-8-9 13' 6" 2 hander built by R B Meiser Rods out of Ashland, OR. Bob designs all his own blanks and hand builds all his rods. Each is 'customized' to the individual buyer from finish/fittings/to grip size. This particular rod will run you about $575 with a second tip provided. He has a web site so you can view his work.)

With summer flows you could easily be down in a 6-7, or higher flows with a 10 wt rod.