What's the best radio for the US (HSPA AT&T)?

[Guest itpromike]

I've recently flashed my ROM following the guide here http://forum.xda-developers.com/showthread.php?t=581981 and in that process it has you flash your radio. I've noticed that my radio isn't as fast as it was previously so I was wondering what the best/strongest/fastest radio to use for the US?

[Guest Hypock1]

Very interesting... soz to double post, but how about australia?