Don't know about the difference in performance between your X1300 Pro and the 2400's or even the low profile NVIDIA 8400GS's, but Powercolor have a few out now here in Oz.
They have a low profile Radeon HD 2400 XT PCI-E, 256MB DDR3, 700Mhz clock, Memory Clock 700 MHz x 2, still a 64bit Memory Interface, but that's a step up from the one you have linked to.
Link to low profile PowerColor HD 2400 Series