Well, you shouldn't need both AppleIntelE1000e.kext & Intel82566MM.kext. Anyway, who cares if it works !
Any 5450 with low profile is fine. About performance, I don't think there's much differences between them since they're based on the same chipset. In the list you provided, there's none and they all use passive cooling.
While 5450 series are advised in this guide, you can possibly use any low profile GFX card as long as they're not requiring too much power (i.e. : those who need an extra power connector) whether it's from AMD or NVIDIA.
For compatibility concerns, you'll have to use Generic DSDT. It should work for most models.
I have two LP graphics cards (don't know the type at the moment) but both didn't fit because the heatsink was too large (both were passive). That's why I was wondering which one I should take considering the size and airflow condition