I agree with eburacum45. If your intent is to try and signal beings on planets orbiting nearby stars, why not wait till later in this century, after we've had a chance to build and operate terrestrial planet-finding telescopes, and have had a chance to more closely analyze which such planets seem to be harboring life?
We can then build sufficiently large radio telescopes to be able to detect artificial radio transmissions, and THEN, we can try budgeting your message blaster. Really there is no hurry on this one.
Forming opinions as we speak