Which IR receiver?

Hi searched this forum and also the internet. I want to buy a IR receiver to connect to the GPIO ports.
As I want to use my Logitech Harmony to control XMBC (at the moment openelec).

I found several TSOP receiver, but I am lost in which is the right one. Some say to get a 3.3V version, others just use the 5V one.
Anyway these I found in some forums:

TSOP4838 (5V)
TSOP34838 (3.3V)

TSOP34138 (3.3V)

TSOP31238 (3.3V)

Could someone tell more?