Jason, I've actually been Euro Nymphing for about nine years, having taken a lesson with George Daniels in 2011. I use three rods mainly, a 10' 4W Cabela's CZN, a 10' 3W Echo Shadow, a TFO 3W drift rod that can be configured in 9', 10', 11'3" and 12'3" lengths. I love the Echo rod, and will start with it unless I anticipate big fish. On Penns I'll use the Cabela's rod. I use the TFO rod when I'm dry fly fishing and may need to nymph; the 1' extension fits easily in my waders and the conversion can be made without removing the reel--though I typically do. I haven't tried the 11'3" for nymphing, but did try some trout spey with it. It's a lot of fun to play around with, and not too expensive. You might give it a try for those days you just want to carry one rod. That's why I got it.
One of my favorite places to get information about nymphing is Dom's Troutbitten website. He also regularly emails articles out if you get on his list. I fished with him about a year ago, and he's smart and flexible. I've heard good things about Olson, and will pick up his book. I like George Daniels' books too. Although I almost always use weighted flies and try to avoid split shot, I've gone back to using split shot a bit more, especially in low clear water fishing scud patterns etc.. I rediscovered scuds this summer in some low clear conditions and they worked exceptionally well on some pressured streams.
Dom stresses the need to adapt, and has lots of articles about different approaches for different conditions. I used mono rigs (really long leaders, with no fly line in play) a few times last year and this, and a couple of days last fall in very low clear water it really paid off. Something else to try.
I've fished dries on the 10' rods when I had to, and it can work. My typical leader for euro nymphing is a 9' 0X plus sighter and tippet as per George Daniels' recommendation. He's dropped to recommending 3x recently, but I am sticking with the OX for now. You can easily cast a dry with it adding the right tippet. Or you can remove the sighter and throw streamers. I've caught fish on dries using a mono rig, but it is tough to cast.
"He spread them a yard and a half. 'And every one that got away is this big.'"