New i7 build questions

[chickenroyal]

Hey all, I'm looking to build my first PC (getting a friend who has built PCs before to help me put it together!) and I'm hoping to get some feedback before I order the parts. I've read around on these forums and other sites so I'm pretty sure I will be fine, just want to be even more sure!

Specs:
Mobo: Gigabyte GA-X58A-UD3R Intel X58 Socket 1366
CPU: Intel i7 920 2.66GHz 8MB Cache Socket 1366 Retail
Heatsink: Titan TTC-NK85TZ/V2 Fenrir CPU Cooler
RAM: Corsair XMS3 6GB (3x2GB) DDR3 PC3-12800C9 (1600MHz) 1.65V
GFX: XFX ATI Radeon HD 5870 1024MB DDR5 PCI-Express
PSU: Corsair 650W TX
CASE: Coolermaster CM-690 II Advanced Dominator
HDD: 2x Western Digital 500GB SATA II 7200rpm 16MB Cache
Fan: Sharkoon Silent Eagle 1000 120mm Case fan (for intake on side of case)
Thermal paste: Arctic Cooling MX-2 Thermal Compound
(Using the DVD drives/Memory card reader from this PC)

Couple of questions:

• I'm only wanting to mildly overclock the CPU, to around 3.4Ghz~3.6Ghz (depending how far I can go without adjusting voltages); will that heatsink be alright to keep it cool?
  
• The mobo doesn't say 1600MHz RAM is supported, would it just be case of upping the voltage in the BIOS to get it run at that speed, or would I have to alter voltage and speed/frequency?
  
• If I have to alter the voltage for the RAM, 1.66V will be safe, even though max is meant to be 1.65V, right?

Thanks in advance for any feedback, I really appreciate it.

 

[chickenroyal]

Thanks for the help

Should have noted, I'm using one of the HDDs from current PC, getting another to match. Though I'll have a look at that one you suggested hlennie, probably get that instead.

 

[chickenroyal]

yeah, I was considering getting the 930, then saw it'd make more sense to get the 920 and a better heat sink with the money saved to OC it.

EDIT: Thanks for all the help, ordered the parts. Got the 750W PSU to give me more options for any future upgrades.