The first CPU you mentioned would be faster, HT speed doesn't have a very big impact on performance while clockspeed does.
The only "benefit" of AM3 is the ability to use DDR3 memory, which is typically more expensive than DDR2.
AM3 CPUs work in AM2+ mobos while AM2+ CPUs won't work in AM3 mobos.
so does that mean the ECS geforce 6100pm-m2(supporting am2+) will support new athlonII processors with am3 type??