For the stand itself, I'm a big fan of Lone Wolf Alpha stand. It's big enough for my size 13 boots and they're quiet, period.
For the tree, I prefer pines, hemlocks or cedar OR a regular hardwood tree next to a couple of the above that will give me a good backdrop. Height depends on the trail location and cover. I probably average 12-15 feet to the base of the platform. I've got a couple at 20 feet. As noted above watch the shot angle. The higher I am, the farther from the trail I like to be. 15-18 yards is probably my average.
Don't underestimate the use of a ground blind on a embankment/hillside above a good trail. I've got a couple of spots that are about 20 yards off good trails that are 15-20 feet down a hillside with some juniper/small cedars around the back of the back/sides of the blind for cover. I just dig a comfortable seat into the side of the hill and put a little cover out in front for an effective blind and avoid being in a tree that does not provide good cover. This is especially important in the late season when there is no leaf cover. I think at that time of the year, a good ground blind is much better than a marginal tree stand setup.
Also, for those 'permanent' funnel locations that have good trees I like to set up a ladder stand to get to height I want and then put a Lone Wolf stand off to the side that I can step onto. I like the ease of climbing up and down a ladder stand, but don't like sitting on them or bow limb clearance on some. Usually you can find them for 60-80 bucks on clearance at the end of the hunting season at the various box stores.