If you are on a budget but still looking for headroom to overclock some, then you may want to take a look at the various Core series kits from Avexir. This reviewed 1600MHz 8GB kit sells for about $43 from places like Newegg. However, the really nice thing about these is that despite it's low price you are able to get clocks well above 2200 MHz, while not needing in excess of 1.65 volts. This is definitely peace of mine for anyone worried about damaging your CPU.
And not only do you get a kit that can overclock well but you also get a kit that has a nice and unique lighting effect. The blue that was part of our kit would look great on a motherboard like many of the mid-range ASUS and Gigabyte offerings. Another plus to the kit is the overall height of the modules. You will be pleased to know that many of the high-end coolers will not have a problem being installed over a kit like these.
The price is good as well as the performance; we have no problem at all recommending a kit like this.