I Think Pure Vanilla and galexperia are best rom and with minimum bugs. CM10.1 comes with lot of bugs but Lot more features also.
CoCore-E-4.2- is good and also saves battery
I prefer CoCore-E-6.8- it consumes more battery but performance is very nice
Try this kernals with different Custom ROM and u will come to know which is best for you.
you can search all this downloads on xda