Generally, for that budget and gaming purpose, I would go for RM220+- processor. Pentium G850, for example.

Since you want to talk about clock, performance per clock goes :
Ivy Bridge / Sandy Bridge >>>>>> Llano / Piledriver >> Bulldozer

Going to practical side :
If you are going to overclock Bulldozer, you need ridiculous clock speed to achieve the stock performance of Ivy Bridge.
Due to this, Ivy Bridge is a better choice provided the price is similar.
What you earned : money from getting good cooler to handle the heat, TNB bill (high power consumption).

It is true that FX-4100 has better multithreaded performance than i3. But for that price, you can get older Phenom II x4 955, which actually performs faster than FX-4100 with changes left.

This post has been edited by kingkingyyk: Oct 29 2012, 01:54 PM