I am using four rods for streamers, two may surprise you, two won't
The "traditional" streamer rod is a 7 weight Orvis Recon with a Rio Streamer Tip line.
My "only comes out on a sunday" streamer is a Guideline Fario CRS in a 6 weight with either an SLX or mono rig.
My preferred streamer rod is a 5 weight Taniwha glass rod with an SLX.
My new found passion is 10 foot 2 weight Taniwha Nano Helix with a mono rig.
I have almost exclusively turned to variants of the Martins Minnow for just about every single situation. It is such an amazing fly. The 2 weight with a 5.5mm beaded Martins Minnow lets me plop the fly under far bank branches on the Don, and fish almost immediately it hits. If I want to swing a streamer, I use the 5 weight and just let the current work it all. The 7 weight is used on big, evil streamers, but if I where honest, it vary rarely comes out to play as the MM does so well.
However, I must also say that I never leave home without a box of Woolly Buggers
Having a line with plenty of weight up front helps, especially with the bigger flies. The Rio Streamer for example, flies. However, I find myself using a mono rig more and more as it is so good when you have high banks behind you, or really short drifts to try. You can also pop a fly into tiny pockets with no drift or current to pull the fly out. On small to medium rivers it excels.