who should godzilla fight in the 2014 movie?

Sorry to burst your bubble, but Legendary pictures only has the rights to the Godzilla character, not any other Toho monsters. So whatever monster(s) he does fight, if he fights any at all, will be completely new.

why not a space monster

if it were anguirus it would be just like his original first monster fight

Godzilla should fight a "Human made monster" Not like Mecha-Godzilla. But like how we would(In movies) Make a virus that turns humans into zombies. Scientist would make something that would evolve and grow too be bigger. Example, NEMESIS from "Project Nemesis".

what if they put Cloverfield in Godzilla 2014 that would be awesome

GODZILLA21 - In Edwards' upcoming film, Godzilla is slated to do battle against 2 or more creatures known as the MUTO. Now, IF it were my choice, I'd have him sqaure-off against Gigan and Space Godzilla. Space-G deserves a good reboot as his original incarnation was less than glorifying, and Gigan has always been an awesome adversary! :)