1. Yes, The Asrock n68-s is compatible for them. It supports the following ones: AM2/AM2+: AMD Phenom FX, Phenom, Athlon 64 FX, AMD Athlon 64 X2, Athlon X2, Athlon 64, Sempron
AM3: AMD Phenom II X4/X3, Athlon II X4/X3/X2
2. I don't recommend you to buy this mobo. It has a very low quality. The GIGABYTE MA785GM US2H would be a much better option. It's cheap and performs very well.
http://www.gigabyte.com.tw/Products/Motherboard/Products_Overview.aspx?ProductID=3141