I'm also looking at upgrading my HTPC computer. Currently looking at an NSK2408B and an i3 3220. Like you I want to be able to playback blu-ray 3D.
I've done a little bit of research on the 3D playback and from what I've read the ideal video card (in terms of 3D quality) is an nVidia 430GT or 630GT which are around the $100 mark. I would love to be able to do without a discrete card though, but so far I haven't been able to get a definitive answer as to whether the HD2500 in the i3 3220 can do 3D. Have you found any info on this?