You can add another 120mm fan, but the heatpipes is really where the heat transfer takes place. They can only pull so much heat out.
For me, I don't want my volts to be over 1.35 and average load temps over 80C for daily use. Since you have already bought it, I would not worry too much about it. Hook it up and overclock the chip. See what you come up with as your temps may be good.
For overclocking, download Cinebench r15 and Intel Extreme Tuning Utility (XTU). Open both programs in windowed mode. You want to monitor your temps through XTU and run your bench through Cinebench. Run a bench at stock speeds and write down the score. That is your baseline.
Then restart your computer and go into you bios. Change the CPU frequency multiplier to 50 (50 X 100 = 5000mhz) and change your v-core to 1.3 volts. Save and boot your computer. If it crashes, then up the voltage to 1.31. Run the bench and watch your temps through XTU. Spikes over 80C is fine, but when the temp levels out, I don't like it over 80C.
Keep upping the voltage in .01 increments until you get to 1.35 or you are able to run a stable bench. Don't worry about breaking your CPU. It is harder than you think. CPUs downclock to prevent damage at 100C. If you get temps that go to 90C, then stop the bench, reboot and adjust voltage. Just go slow in .01 increments and you will do fine.