[U-Boot] Which Version of Cross-Compiler should i choose?

Hello,everybody,i am new to uboot. now i choose v2010.09-rc2 Uboot for porting. I used to compiling uboot1.1.2 by arm-elf-20050511 and works well.Now i do not know which version of arm cross-compiler to choose? Any suggestions are appreciated ! Thanks all . By MrGates