Best meat replacements for a vegetarian/vegan? Let's compile a list of vegetarian/vegan meat replacements.

Generic replacements:


Seitan
Tofu
Tempeh
Quorn
Quorn Vegan Alternatives
Paneer
TVP


Commercial fake meats:


Tofurky (Roasts, Sausages, Deli Slices)
Lightlife
Morningstar
Worthington Foods
Boca 
Simple Truth (not exclusively vegetarian/vegan brand)


Similar products (nutrition):


Beans
Mushrooms (Portobello, oyster, trumpet, so many more…)
Pardon my rampant vegerianism, but the trick is not to substitue meat at all.

I generally get my nutrition from other sources, without using meat substitutes at all.
Unless I really feel like a certain recipe that I used to like back in my meat-eating days.

Use beans, lentils and whole grains for protein.
Use nuts, seeds and avocadoes (or any other fatty fruits and vegetables) for B-vitamins.
Use beans (again) and leafy greens for iron and calcium.

So, it turns out my answer is a bit Zen.  Sorry.