@irontoenail - I personally think that the best kind of trekking shoe is actually the hiking sandals that you can get from specialty shoe stores. You don't have to worry about sweat or even getting blisters if you have a well fitted pair and you wear them in properly. I've had a decent pair of trekking sandal last me several years, and lots of difficult hikes.
Of course, you can't wear them on all terrains, and in some cases you've just got to have closed toed shoes.
At which point, I agree, you should put time and money into getting the right kind of socks. They don't have to be thick though. You can get special hiking socks that wick away sweat and cushion your feet without being too heavy.