Probably the only time I will ever recommend AMD for gaming, but I think vs the pentium, I would choose an Athlon X4 or even FX6300 for the sub hundred dollar category. (Not sure of the price of the FX6300, but I know you can get a really cheap price plus a mb combo deal at microcenter). You give up performance in single threaded games, but probably still good enough, and have more flexibility for current and upcoming well threaded games.
I really hate these build articles that set a hard limit on price though. Granted you have to stop somewhere, but especially in this low price category, you can get a *lot* more performance by being a bit flexible with the budget. I especially hate the argument "buy a super cheap cpu and invest more in the gpu." Or "buy an APU because I cant afford a discrete card". Well, you are going to have to live with that system for a few years. Is it really worth it to save 40 or 50 dollars and have subpar performance for that length of time? Just wait a bit or cut some other expense somehow, and get at least an i3 or locked i5. A used i5 is also attractive, but unless I knew and trusted the seller, I am reluctant to by used hardware.