Vigor Monsoon III vs. Kigmatek Dark Knight for i7

Which of these is a better cooler? The price is the same with a combo deal with the 920 i7 processor - so that is not an issue. Any advantages to either? I am looking to do some overclocking- but do not need to go crazy.

Vigor Monsoon III LT Dual 120mm Fan CPU Cooler Socket 1366 Ready - Retail

XIGMATEK Dark Knight-S1283V 120mm Long Life Bearing CPU Cooler - Retail

I know these things are huge - and was thinking of using this case -
COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case - Retail
Any advice on this? Or a similar case that is a known good fit? Thanks!

I would go with the Xigmatek too...they have a great reputation for being a top performer...and its cheaper too

I own a vigor monsoon, and my friend owns a dark knight.. and there isn't a day that goes by where he wishes he got another heatsink. mine out performs his idle temps by 9-10c.. of course, the monsoon is more money..

If you can afford to pay the extra $15, get the monsoon.. If you plan on going water cooling anytime, get the dark knight... so you feel like you aren't throwing away such an amazing heatsink.

Both me and my friend are running stock with no lapping. I didn't purchase the arctic silver compound, i used Coolermaster Compound that came with the heatsink.

My friend is useing some compound/grease that came with his heatsink, the stuff is probably junk he says... and might be leading to his poor temps in comparison to mine. However, we are running identical systems with Antec 1200 cases.