I would get the wf for the BIIT, the rod loads great with just alittle line out anyway but has the reserver power to cast some line out there. I think on longer cast that your might have to make the dt would overload the rod. I think the Wf not the Dt will compliment the rod the best. Also Winston even recomends using a wf line on the rod. No for types of lines GPX no, its made for fast action rods. Get yourself a SA gxp, SA Trout tapers or a rio selective trout line.