It depends. Do you prefer assassins? Do you prefer safe farmers/teamfighters? Do you prefer pushers? Or maybe you like strong gankers?
I know you want to narrow it down to 4 champions, but mid lane is probably the only lane with so many champs under the same "category" that all function differently and all have different counters and strong points in the game. Therefore, I'd suggest these champs:
Diana,
Kassadin,
Orianna,
Zed,
Twisted Fate,
Ryze, and
Kha'Zix. You can also try out
Kayle mid, since she has some amazing AP scaling and really good utility. She also bullies nearly every champion in lane, and her ultimate is always useful. If you really want to narrow it down to 4 champions, maybe these champs:
Diana,
Orianna,
Zed,
Twisted Fate. That provides a mix of assassins, utility mages, pushing power, and strong ganks.
I know you want to narrow it down to 4 champions, but mid lane is probably the only lane with so many champs under the same "category" that all function differently and all have different counters and strong points in the game. Therefore, I'd suggest these champs:













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Thanks. I really want a mix to be able to try and adapt to what my opponents have. I really don't have a particular type of mid leaner I like, though I guess I do like champs with some burst more. My main thing for each role is to try to use champs I like but also that vary enough to cover each others counters. Also, with top and mid, I want to give options for both ap and ad champs, in case the rest of my team goes all ad or ap.
Edit: I just realized I left
Nidalee off of my list of possibles.
Edit: I just realized I left

i think the reason you have not been able to narrow it down is because mid lane has some of the most varied and flexible champion possibilities.
narrowing it down to four maybe too little
i would suggest:
Lux - really strong all around with no real hard counters
Ryze - fits a lot of team comps - brings his own cc, gets tanky and dishes out huge damage late
Kassadin - an absolute late game terror and shuts down a hell of a lot of Casters
Zed - pure Assassin, you can shutdown the APC in lane then keep taking out the ADC in team fights before they know what happend
Kayle - is a strong pick also, especially against burst damage mages and assassins
Diana - really strong at the moment i think
* I would not recommend
Fiddlesticks mid... i just never found him to be really strong in mid lane but that is just my personal opinion
GLHF
narrowing it down to four maybe too little
i would suggest:






* I would not recommend

GLHF
I'd definately say
Kayle. Great champ in soloq as you can save your friends aswell as getting fed as **** and stomping everyone. She's also quite easy to learn.


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Seems like the consensus is
Diana,
Zed,
Ryze,
Kassadin, and if I can get her
Lux. I'll consider expanding later to include
Twisted Fate,
Orianna,
Akali, and
Kha'Zix.
I have a pretty good grasp of
Diana, so I need to start focusing on the others. Thanks for the ideas guys. If anyone wants to still throw in their 2 cents, go ahead.









I have a pretty good grasp of

Scott Azrael wrote:
Seems like the consensus is









I have a pretty good grasp of

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People are very quick to dismiss
Annie for some reason. I main her mid and melt faces repeatedly. She is a safe farmer, decent pusher mid-game, and an excellent ganker.
Put some
Mobility Boots on her and you have your gankiness.
Tear of the Goddess on your first back will give you much needed mana regen (for early pushing) and gives you a badass item late game.
The same goes for
Ryze although he doesn't have the mana sustain early game that you need.
I end most
Annie games at around 700 AP, and annihilate.

Put some


The same goes for

I end most

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So, I'mm hoping you guys can help me to narrow down my list.
Will use
Possibles
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Not used much or don't have but can buy cheap
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As you can see, I have a lot of champs that I can choose from. I could even try something like AP
Let me guys know what you think. I am just struggling to narrow it down and would love some input. I had planned on
Edit: added Nid