Playing for keys...

so. I recently got TWO key fragments,for the first one the fragment I got before it was a month ago. and I play LOL every day! so I would lke to know what changes key drops to change my play style to fit those needs. cause I have another box and I got a shard which I turned into essence after buying a champ shard and getting . the problem I have with 'flexibility' is gameplay of,and scaling of roles. support and jungle:eh,whatever. 450 or 1350 IP give it a day or two. top:1350 is your key number but some stuff is at 3150 ADC:i am horrible at this role and just about ANY ADC besides is outclassed by all the 6300s But I prefer to be flexible so my friends can have a better chance for there mid/top champs ect. so I want to get ONE key,hopefully get a champ shard and save 1700 IP buying one extra shard