Please help me for second speedlite?

Hello every one
Some one please help me to get second flash.
current I have T3i and 430EX, I would like to get 1 more flash to use for umbrella flash.
My Canon 430EX build in wireless it work verygood with T3i.
I don't have money to pay for 580EX.
which speedlite do the same job with Canon 430EX or 580EX.

Please help.

Thank You

If you don't need ETTL I'd go with a YN-560.

^^ agree for the price. I have 2 and love them.

Yongnuo would make a GREAT manual or slave flash!

Thank You.
Does YN-560 build in wireless sensor or I have to use wireless strigger?

They have an optical sensor, but I use cactus v5's with mine.

If you want to use your built in wireless controller look for a used 430ex, or 550ex. The original 430 can be had under $200 and works great off camera.