[ovirt-users] CPU family: which should I choose?

Hello, I am a bit confused about the CPU families. When I installed my host, it prompted me for the CPU family to use, and gave me a list of CPU models to choose from. I chose the default suggestion, model_SandyBridge. I don't recall all the choices it gave me offhand, but when I run ' vdsClient -s 0 getVdsCaps | grep -i flags ; echo -e -n "\n" ;cat /proc/cpuinfo | grep "model name" | head -n 1', it indicates the following models detected: model_Nehalem model_Conroe model_coreduo model_core2duo model_Penryn model_Westmere model_n270 model_SandyBridge Which one would provide the most compatibility? Is there a list of CPU family "hierarchies" which would indicate what model(s) could fit with what? Thanks! :-) -Alan