You would be surprised but here is a $30 AM3 motherboard after rebate ($40 before).It won't take CPU's above 95 watts TDP but you will be fine.
Can't crossfire or SLI on it though because there is only one slot for a graphics card.
I myself have an earlier AM2+ variation of this board.Surprisingly I am quite pleased with it. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
What kind of GAMES will you be playing ?.............. and, that mother board posted above, 1) the 6150 chip set gets very hot.. 2) not very good for gaming. Didn't look but if it only supports 95watt processors you'll be limited. Also, what other hardware will you be using... anything left over from another build ?... memory, etc.
You are absolutely correct the Nvidia 6150 is a lousy IGP especially lousy for gaming.
That's why most people will not use the on board IGP and why I mentioned the combo deal with the discrete graphics card.Yes it has a 95 watt CPU TDP limitation probably not good either for over clocking either.But in it's defense it's dirt cheap (practically free) especially with that graphics card which is a decent budget card above the HD 4650 in hierarchy and on par with the HD 4670.A AMD 785G chipset also gets quite hot as well when used for the IGP.
To the OP why not opt for a Athlon II X3 445 or 450 CPU instead.
Here is an article for you.Especially look at the gaming benchmarks
Im buying an ati/amd 5830 or a 6850, so igp isnt really a selling point. in my area of the world, gigabyte and asus motherboards tend to make up the majority of motherboard sales so those would be the boards i would be looking at.
Regarding cores, im buying 4 cores for the 'future', just so the pc it lasts a bit longer without being upgraded.
As far as games, crysis 2, metro 2033, dirt 2 etc.