You should look into getting a Phenom II X4 965 which is at 3.4ghz and might be able to reach 3.8-4.0ghz if you know what you are doing. Or do one better like I did, buy an AM3 motherboard that unlocks AMD chips (only for phenom II and Athlon II) and snatch up a Phenom II x2 555 and then unlock the other 2 cores. It is hit or miss that they will unlock or be stable but the success rate is actually pretty high on those chips. I did it, mine runs fine at 3.6ghz (400mhz overclock) and have had success with 3.8ghz.
Of all the new FX Chips, the 4000 lineup is extremely mediocre you'll get more out of the phenom II.
I think your biggest struggle would be skyrim, as it is probably the most graphically intensive of the three. WoW can run on pretty much anything, and SWTOR does not seem all that impressive in the graphics department.
Personally, I have a intel i7 920, gtx 285, 6gb ram, and was able to run skyrim on high settings with 1920×1200 resolution. I think you'll be fine.