Thanks for the vote of confidence Skunk, but I'm just one man's opinion.
Finding the perfect machete is like trying to play 18 holes of golf with one club. There are so many different types of vegitation that you could apply a machete to that it is a very hard question to answer.
I use Tramontina machetes mostly because they are cheap, about $5 and available, sold in bins and buckets at every hardware store. Here in Central Brazil they are sold from 10 inches to 20 inches of blade length, the most popular being the 14 and 16 inch.
The short machetes are great for clearing brush in camp, chopping out roots, shelter building etc. If you get into really thick bush and vines and need to chop to travel then there are alot of factors that will influence the blade you want.
For tall grasses and fleshy plants a long 16 to 20 inch blade allows you to cut them low to the ground without bending and stooping all day.
I just spent about 2 hours yesterday chopping down thick clumps of razor grass with a 16 inch Tramontina and I was wishing I had an 18 or 20 after about ten minutes. My friend was using a 13 inch Saico, heavy broad blade and was having a hard time of it. On the other hand that same Saico will deal with saplings far more effectively than the lighter Tramontina 16.
A 16 and longer blade is really irritating to have on your belt all day. In the bush I normally use the 14 and 16 inches. When I take groups out I give them a variety, 14, 16 and the Saico to let them get a feel for what they like. Alot of what people settle for depends on their body type, height, arm strength, etc.
Two hours of chopping yesterday and I'm feeling it in my bicep and the top of my forearm today. If I had used an 18 inch Ontario I'd be typing one handed right now. Not that theres anything wrong with the Ontario 18, it's just better suited for woody brush than the constant repetition of grass.
My logic follows the Brazilian culture on machetes. You go out and buy a really snazzy sheath for the blade you like best and then proceed to chew through machetes that fit it. When they get worn out, ie. start looking like you hit a few too many rocks and filed out the dings, you buy a new one. The thought of spending big bucks on a machete kind of leaves me puzzled. They are designed to do the hard tasks and get sacrificed in the process.
I am a firm believer that cultures develop the blades they need to deal with the problems they face and that those decisions follow the collective wisdom of countless man-hours of use in that area. Look at whatever blade is traditionally used in an area and use that as your starting point. If after serious use you think that you can improve on it then do so, but most likely you will be satisfied with its performance.
I have a basket upstairs stuffed with machetes of many types, lengths, weights, and steels. The one I use most is a 14 or 16 inch Tramontina. One of my favorites is the 14 inch Tramontina Bolo, very good general use blade.
Others here are far more qualified to talk steel types and hardness etc. Mac