This topic is inevitably going to turn into "Look at MY hud!". It only works in 1280x800 and lower, but it's fantastic. I play comp and it's been working pretty darn well. I helped Sevin with MvM stuffs, which is why everything is pretty much finished on my HUD.
I will optimize the HUD for End of the Line, trust me.
But don't look at mine.
PVHud: I see no reason for this HUD. It's the most popular, but I find it terrible. The health is too big, and the target id health is too small. The font choices are also pretty bad.
EVE Hud: Probably a second choice. Can't see disguise HP at a number.
KBNHud: This hud is pretty good for comp, but font isn't my style.
Broeselhud: I dislike it, and I can't tell you why. I know it's another second choice, but many HUDs are modded off it.
TFPlus? Hud: This guy's hud got a bit viral. It is the best of the popular HUDs I've seen, but the avatar location isn't that good.
Garm3n Hud: I love Garm3n's HUDs, simply because, besides the "Skill: 1337" in the scoreboard, they feel immersive and professional.
Yes, my hud has hit flashing circles. You can do it with eve, too, but I just made it look better with antialias. The Medic HUD WORKS, but it's not centered as in "I need to see the uber % freaking everywhere, since I don't ever play Medic." . Minmode is also too minimal.