get the ego.
it'll last you forever and the mechanics of work and maintainance are identical to that of the etek.
now, honestly, you don't really need anything above that etek you already own. it's a solid and reliable marker.
say what you want to say, but in my years of experience, specially with all guns PE, the etek3 is just an ego 9-10 without the screen.
learn how to tune it correctly (egos and eteks work right out of the box like monsters, but with propper tunning they become precision instruments and work like an absolute charm)