Whoopee!!!!
I just knew that as soon as we opened this thread that we'd begin to get into the breed religious wars!!!
Been there... There is no such thing as the "right" breed. Except what is "right" for your operation, your management capabilities, your pocket book, your terrain, flora, fauna and emotional needs. In other words..your cowboy religion.
I subscribe to Jon Bonsma's credo: Form follows Function. In my opinion that is for both the cow and cowboy( see: [SIZE=-1]Bonsma, J. 1965. Wortham Lectures in Animal Science, Wortham Foundation, Texas A & M University Press, College Station, Texas.)
This report from the Missouri Forage and Grassland Council is also interesting and worth a studied read. [/SIZE]
We can see right here on TBN the vast, vast differences available from a few well kept tame acres to thousands of what's out there brush and rocks. From cattle with individual names to cattle that are lucky if they have a brand or ear tag at all when they hit the auction ring or feed lot. From marketing that pushes a black hide and a high marbleing content because fat tastes good to grass fed nostalga because it is "more healthy" .
Beware of thinking you can ALWAYS hear the electric fence popping...'tain't true. And, after you walk back and forth many times hunting the problem, you will decide that switches at EACH fence corner for EACH fence segment is the best way to go... and this will send you on a search for cheaper switches.
Spiveyman... if you think that with the new high intensity fence chargers that you can bring yourself to KNOWINGLY touch the fence..you are more punishment prone that I am. Even the old method of taking a green grass blade and sliding it up the wire until you feel a tingle doesn't work... I still get the FULL shock when it comes thru... trust me... a 5 light tester that runs up to 8000 or so volts is the only way to go.
Spiveyman... looked at your pen layout..Lots of good going on there. Suggest, strongly, that you go ahead and make a large pen in the expansion area with a fence from the edge of the barn over to the other fence. Then, make gates from the pens into that big one. Reason is that you don't have enough room to train the animals to come to feed thru the chute.. they need a large area to move into.. this is the expansion pen I'm suggesting. Also, you will need to be able to move stuff out of the pen right next to the chute so you can work on stuff without worrying about your back side....yes, you can get away with working stuff in a chute and have cattle at your back.. but there is always that unique situation when some calf bellers in the chute and its momma just happens to be right behind you in the pen.. swings her horns.. and catches you in the UNAWARES

I know that there is lots of information about raised walk areas around chutes, etc... unless you are dealing with lots of animals a lot of the time, I'm not sure that they are worth the expense... I don't have any.. considered them necessary once, but never got around to building them.. and wouldn't now.
EasyEd, I tried the polywire and found it to not be a good deal... at least for anything but a very temporary situation. It breaks easy, doesn't tighten up well, gets wrapped into stuff. I own some but it's left over from my experiment with it... bad way to spend $$ in my opinion unless you have extremely tame pastures and only need very temporary fence control with trained mature animals. Also, I dunno about a 8' wire... all that wire, tall posts, effort just for 1 cow... or the next one that also decides to try jumping... and even at that, I'm not sure that such a tall wire would be as effective at preventing fencing pressure/jumping than a single strand of high tensile wire with 8000 volts on it at about 36 inches off the ground. Such a single wire (I actually prefer two wires reinforced with 3 strands of barb) also teaches calves about fences early.