For a budget gaming build, a quad-core Phenom is the way to go. The 970, however, is not the one to get. If you aren't comfortable overclocking, you should get something clocked higher, like the 980. If you do want to overclock, get the 955, which is the cheapest Phenom II with an unlocked multiplier.
^Agree with getting the i5 2500k for sure. You don't need the x6, games cannot make use of the extra cores. The i5 will handily trounce any AMD offering. I have been an AMD user for 10 years, or more. I just got a i7 2600k....upgraded from a AMD 965 X4 build. No comparison what-so-ever, the Intel build simply leaves my AMD build in the dust.
either the phenom 955 if on a tight budget, or, spending any more money than that you should get a core i5 2300, 2400, 2500. Much better than AMD for gaming. Also avoid 6 core AMD cpu's you wont see any benefit in 99% of games.