Mates, we have a problem.

KEK isn't enough anymore. It has lost much of its power.
LOL is alright but nothing special. The traditional approach.
LEL is ok, but only for certain circumstances (irony may be one of those)
JEJ never really caught on and isn't that great imo.
IEI is too many vowels and really sucks.
OEO is getting to the point where nobody knows wtf you are saying.
PEP has potential but I don't see it catching on.

What are some good XYX alternatives? I am looking for something to pack a punch!