I dont know what champion to buy currently, for now for my last few games I played Nunu as a mid just for fun and done pretty well. But, Nunu doesnt have long ranged so its hard to play mid with him. So I was wondering what champion is versatile as mid or supp and has good sustain under 4324 IP.
I notice that you're level 13, and in my opinion you'll probably want champs that can snowball or single handedly carry games. Off the top of my head here are some:
450 IP, has great burst and game winning AoE stun ult. She's pretty sustainable in lane, and if you can use your passive has a good escape.
(my favorite) 3150 IP, VERY safe laning, VERY long range, and can take control of the lane really easily. She doesn't have much sustain, but she can burst a carry down in a second and most people don't suspect it. Her ult is long range, and you can often secure double / triple kills with it.
3150 IP, despised by a lot of players for her burst combos, and is manaless. She can turn the tides in fights really easily with her ultimate, and she's a very easy champion to play with good effectiveness.
4800 IP, worth saving up for. Even if you lose lane, you can usually make a comeback with Fizz. He's hard to play in lane due to being harassed, but once you hit 6 you can all in and snowball like crazy (usually over 20 kills a game)
4800 IP, hard to play but low level players dont know how to play against her. Poison your opponent to harass, and if they gap close on you spam fangs and watch them die in a second. She's not much of an assassin, but if you stumble upon a teamfight your ult means game over for the other team.
A lot of people might disagree with me on this, but my personal advice is to buy either 
or 
and or You'll need 4500 IP but you're very close.
Both Tryndamere and Nasus are noob stompers top lane, and Lux / Katarina are incredibly strong mid laners with versatile kits and high carry potential. Safe route? Nasus / Lux. Want to dominate? Trynd / Katarina.
the range isnt the problem in mid, the waveclear is. in general, champions who cant waveclear have trouble sololaning often.
if you want to main midlane and enjoying playing one champion only (or mostly) instead of many champions, give azir a shot. if you get your discipline up and stop trying to interact with enemies, hes actually the strongest champion in the game.
annie is really good and cheap shes a meta support and really fun mid
did you not see this guy play in LCS today he is broken AF
Don't forget 
. She is great mid, support, and top as well.
