Leroy.
When recently met John and Amy Hazel at the New Jersey show they were telling me that they were exploring the Under Hand style of casting.
I see your in the same area,maybe hook up with John and Amy and have a chat.
I leant John my Vision 8/9 Euro line to try.It's a great line to start learning the Under hand cast.
Yes,there are Loop and various other lines avaliable out there,but in my opinion the Vision is the best line to learn with.
For your 12'9" 9wt. I recommend a line that is,approx.35'-40' with a grain weight of approx. 475-525.
Check out our line charts on the G.Loomis web site or here on the Spey Pages.
If I can help further please ask.
Speyladdie.
Loomis Pro Staff Canada.