Core i5 760 - CPU Cooler and RAM Question

Hey everyone, thanks for taking the time to read my post.

First off, here's the specs. for the main components of my 'rig':

Case: Coolermaster Centurion II (with a total of 5 120/140mm case fans)
M/b: Asus P7H55-M
RAM: A-RAM 4Gb (2x2Gb) DDR3@1300MHz
PSU: Gigabyte Odin 600W
CPU: Core i5 760@2.80GHz (currently running the stock cooler)
GPU: Gigabyte Nvidia GTX 560 Ti SuperOverclocked Edition

As i do not want to (read: do not have the $$ to) upgrade to a Sandy-Bridge Processor and associated Motherboard, I'd decided to overclock my current Chip to wring some more performance out of it. Can you guys please suggest a good aftermarket cooler (air only); while I know I should be sensible and go with a Coolermaster 212+ or something similar, I've been eyeing off a Xigmatek SM128164 Colosseum. Have only been able to find one 'review' of it, though it was hardly comprehensive and non-conclusive. The reason I like this is because a) it looks awesome b) it actually looks like it would do a good job and c) the blue fan would suit all of my other blue stuff great (yes i know that sounds petty, don't judge  

However if anyone has any other suggestions regarding this it would be much appreciated (budget = <$70).

The second thing is, I would like to upgrade my RAM. My current Memory is pretty much as cheap as you can get - c. $30 here in Australia. Once again, my
'vainness' is coming through, as I want the Memory to look good (i.e. not like my current ones), and preferably blue or blue-ish. I'm looking at 2 kits in particular at the moment:
http://www.pccasegear.com/index.php?main_page=product_i... - Corsair Vengeance, 8Gb, 1600MHz, $75
http://www.pccasegear.com/index.php?main_page=product_i... - G.Skill Ripjaws, 8Gb, 1600MHz, $75

Will these be a noticeable improvement, are they the right ones for my setup, will they fit under most big aftermarket Coolers, any suggestions would be appreciated (budget = preferably around this^ price, but would consider up to double that).

Thanks in advance  

Troy