Thanks for the input!
The following page clearly states the TrueHD and DTS-HD Audio Bitstreaming is supported, GeForce GT 430 - Features - GeForce . However, reading the 'PureVideo' table on the page Tony posted above it looks like these capabilites was introduced first in Feature Set D (e.g. GT520). It left me a bit confused...
What about this one; Komplett.se - ASUS GeForce GT 430 1GB Direct CU Silent
Hope it will fit in my Antec NSK2480 case, the card looks slightly higher than a normal PCI card.
I have exactly that card and it bitstreams HD formats just fine