The Pinarello will be a full on race-geometry road bike. Can you use it for light touring? Yes, most definitely. Will you want to? If that's the only bike you own, yes you probably will. Would I suggest you buy that bike given your stated goals? No way. The FP1 (presumably with Shimano 105) is a great price, but it will make for a long day in the saddle on your 300km tours. If you are young and limber and race or sport ride aggressively with a group of like-minded individuals, the geometry and subsequent riding position won't be that big a burden on you. The bike will be lighter and more efficient than the others. It has better (ie lighter and more positive-acting) Shimano componentry than the others.

But if you are not the things I described above it will cause you to bend your back more, putting more of your weight on your arms, hands and wrists. Your neck will have to stay bent more so your eyes are still looking forward. The frame will transmit more road bumps to your hands and butt, causing more numbness or irritation. You will probably enjoy your slow riding a lot less than you would on a touring geometry bike.

As for commuting, it depends on what you need to carry, what the conditions are you will be riding in, how long is your commute. I find that in rush hour traffic I prefer the better visibility I have on my commuter than on my race bike. I also have to "hold the line" over potholes, grate covers, road trash, etc., where I would swerve away from it in my typical off-peak-hours race-bike rides. And of course, I like to be able to throw stuff in a pannier on the back of my touring bike, where if I commute on my race bike I have to fill a messenger bag and have that on my back the whole way in.

For me it's best to have several (well, okay, many) bikes, each suited to a different purpose. So I have a modern race bike, a vintage race bike, a commuter, a touring bike, a fixed gear bike, a hybrid or comfort bike, and a handful of beach cruisers for island riding. If I were just starting and had your stated criteria, I'd look only at relaxed geometry road bikes, no matter how good a deal I saw on a race bike. The Sherpa looks like a nice choice. Neither me nor Google ever heard of a Brodie Elan. (http://www.google.com/products?q=Brodie+Elan&hl=en&aq=f)

Edit -- just re-read your post and saw you later mentioned a Brodie Ronin. That looks like a very nice choice also. If you can stick your butt on both the Brodie and the Rocky Mountain, you will know which you really want. I don't think as a beginner you'd see any real difference between the Sherpa and the Ronin. If you really get into this, you'll likely be replacing parts right and left anyway as you develop individual preferences you can't possibly forecast at this time, so you may as well have the decent but cheaper RM, if it fits and feels good to you. Bummer having to drive 4 hours for a bike shop!