Congrats JZ sounds like you've got a honey of a rod in the 5/6 already and the Orvis should be great too.
Start tying up those Pike Flies!
I use flies like these in saltwater on my 8 wt with a short leader tied on size up to 1/0 and 2/0 hooks
(Mustad 34007). For big flies on my 8 I try to keep them sparsely dressed to make them easier to cast and add some crystal flash to make them stand out.
http://www.flyanglersonline.com/flytyin ... 1fotw.html
http://www.flyanglersonline.com/flytyin ... 0fotw.html
and my all around favorite go to fly a sparesly dressed Lefty's Deceiver:
http://www.flyanglersonline.com/flytyin ... 7fotw.html
And for top water, a Crease Fly:
Some of these SW patterns might work for you too in pike fly colors and shouldn't be a problem to throw on your 8 with a good WF line.
Good luck. Catch em up dude!