I'm after a PCIE graphics card to replace the lame integrated one in my HTPC (Geforce 6150LE), it's struggling to play 1080p videos, what would you fine gentlemen recommend as a suitable replacement? It's just for playing videos so doesn't need to be anything extravagant, it needs to be quiet and preferably be an nVidia card (so I can't switch back to the integrated graphics, it has a lot of useful connections that aren't available on new cards like composite). Oh, and it needs to fit in this gap:
That PCI riser will be replaced with a PCIE x16 one. Any suggestions?

That PCI riser will be replaced with a PCIE x16 one. Any suggestions?