According to 'The numbers', upcoming Avatar has the biggest budget, $300,000,000, followed by Spider-Man 3 with $258,000,000.
The top-10:

1 Avatar 20th Century Fox $300,000,000
2 Spider-Man 3 Sony $258,000,000
3 Harry Potter and the Half-Blood Prince Warner Bros. $250,000,000
4 Superman Returns Warner Bros. $232,000,000
5 Quantum of Solace Sony Pictures $230,000,000
6 The Chronicles of Narnia: Prince Caspian Buena Vista $225,000,000
7 Transformers: Revenge of the Fallen Paramount Pictures $210,000,000
8 King Kong Universal $207,000,000
9 His Dark Materials: The Golden Compass New Line $205,000,000
10 Titanic 20th Century Fox $200,000,000
Tied with
Spider-Man 2 Columbia $200,000,000
and
Terminator Salvation: The Future Begins Warner Bros. $200,000,000
Source(s):
http://www.the-numbers.com/movies/records/budgets.php

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