I have to agree with everyone here that getting another cat can help ease the pain of your loss. You can never ever replace your precious Magoo but I like to think that my cats have taught me about love and sharing. There are so many needy cats out there that would love to have a home and would be a great companion. You will fall in love with the new kitty for who it is and not as a replacement for Magoo.
Good luck and keep us posted.