According to some research most of the crypto hashes these days are pretty secure, or at least they are computationally infeasible to break.

Chance of Collision (2 messages with the same hash):

MD5: 1 in 18, 446, 744, 073, 709, 551, 616 chance of collision

SHA-1: 1 in 1, 208, 925, 819, 614, 629, 174, 706, 176 chance of collision
SHA-256: 1 in 340, 282, 366, 920, 938, 463, 463, 374, 607, 431, 768, 211, 456 chance of collision
SHA-384: 1 in 6, 277, 101, 735, 386, 680, 763, 835, 789, 423, 207, 666, 416, 102, 355, 444, 464, 034, 512, 896 chance of collision
SHA-512: 1 in 115, 792, 089, 237, 316, 195, 423, 570, 985, 008, 687, 907, 853, 269, 984, 665, 640, 564, 039, 457, 584, 007, 913, 129, 639, 936 chance of collision

For a bit of scope in the case of MD5:

"If you could try 1,000,000 messages per second, it would take 584,942 years to find a collision. (A machine that could try 1,000,000,000 messages per second would take 585 years, on average."