I haven't fished or cast that rod, but will make recommendations based on multiple opinions posted saying that it is not suited to overlining.

I am a fan of the XXD line, but don't think of it as an ideal line for larger flies, due to its long front taper. It casts like a dream, and mends and roll casts well for me. I am looking into purchasing a 7wt myself for similar purposes and have decided on Cortland's PRECISION STILLWATER TROUT FLOATING line. It has a shorter front taper and is front weighted to shoot well. If you like, you could even get it in a 6.5, 7, or 7.5 weight, as they make all three in that line. Here's a link [url=http://www.thefullcreel.com/files/index.php?id=207:b0051]http://www.thefullcreel.com/files/index.php?id=207[/url:b0051] (if you ask that retailer, he can get the odd sizes for you)

I was considering a totally different rod, the ECHO 7wt, but it sounds like line matching would be about the same for the two rods.