well, any ego you buy is an ego, and any ego is amazing. So see what you like, and also depending on your price range. i would recommend something, but i really have no clue what exactly you are looking for, but maybe an ego 8-10?
Vicious CSL #3 --- Candy red ninja 68/45 --- SEED Rotor
Etha --------------------Ninja 68/45----------- Rotor
I'd suggest anything 07 or newer, the 05-06 can't be updated as well.
07's can have the no qev mod and will be bulletproof, and can also be upgraded
my preference is 08, they got everything they could right that year, people don't get how my ego can be as smooth as it it.
If you get anything put on(unless it already has it) the zick2 kit, either cure4+ or pooty bolt(and get your cure bolt pooty modded otherwise), and the sl3 reg, with those 3 parts you will have a marker just as good if not better than the newest one on the block.
oh and if you want the full update package, get the pops asa too, its pretty darn sweet.