Id say leave in the vitasaw, you have to use the crossbow for it to give the set bonus, and thats a big enough nerf from the needlegun. Huntsman is generally considered ok for comp as well, as a pro gun sniper is always better, though the machinima is always banned in comp. Fists of steel and tomislav for heavy get banned in comp, as do all the polycount hats that gave set bonuses (sniper that cant be headshotted, 10% faster pyro etc.)
Oh, and THE ENFORCER IS ALWAYS BANNED.
Really its all up to you but for my 2 cents add the enforcer and tomislav to the list for sure as they are both fairly unbalanced for comp play.
You're confusing the vita-saw with the Amputator. The Huntsman is broken because of the projectile hitbox (as in the player's, not the arrow's). I'm trying not to ban anything that isn't game breakingly bad, So I'll leave the Machina out. I'll go ahead and ban the Fists and Tomislov, which I overlooked. The DR is already blacklisted, but I'll oblige your request for an enforcer ban.
Seeing as it's starting to get hot enough for my computer to overheat, I'm interested in joining this tourney. TF2 is one of the more... advanced games I can play that won't overheat my computer terribly, and let me tell you, it's a whole different game at 640x480.
Have you tried Chris' highframes or Chris' maxframes? It may be ugly, but it really helps.
I've never heard about them, so... No. Do they reduce the amounts of polygons in the game or something like that?
Chris' Highframes pretty much a special set of graphics options that squeeze a huge amount of performance out of the game whilst not making it look too terrible. Maxframes is the lowest TF2 graphics can possible get, and it looks like you could run it on an NES.