Thermalright Silver Arrow/Noctua NH-D14

I'd suggest you go fo the Archon for ram compatibility.
Your case is wide enough for it.
The Archon has similar cooling performance to the S.A.
S.A. = Length 147mm x Width 123mm x Height 163mm
Archon=155mm x Width 53mm x Height 170mm
Width is the main concern for ram compatibilty(dimm intrusion)
I'll tell you right now the S.A. won't clear your ram if it's regular height Vengeance.(all dimms filled)
Length comes into play with distance to gpu.
Doubt you'd have to remove your rear exhaust fan = something i've never heard before.

If you are in the US, closed loop water coolers have the best cooling and prices are not that much more than air coolers (especially when you don't have to pay extra for thermal grease).

Depending on your case size, these are three to look at.

These fit into a 120mm fan mount like your rear exhaust probably is:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

This requires more space for a 240mm radiator, but by adding 2 more fans it is the best cooling that you can get short of a custom water cooled loop:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Here is a vid on installing on a 650D case:

http://www.youtube.com/watch?v=BWWFjsJONYc

Closed water loop systems don't have the best price/performance ratio.
Plus they're much louder then air-coolers!
All air-coolers come with paste,most come with a tube of paste = enough for mutiple applications.
Yeah we know you like your H100 with 4 fans.
http://www.xbitlabs.com/picture/?src=/images/coolers/ph...

It's a shame that you don't tell people that the reviews are only based on having the 2 stock fans on the H100.  

Short of a custom loop, the H100 has the best cooling performance of any aftermarket cooler, period.

On LOW settings, the H100 cools about 10'C more than a Gaia sd1283 (comparable to the Cooler Master 212). Did I mention that this is on LOW fan speed?

@OP

If you want the BEST cooling without a custom, the H100 in a push/pull configuration is it.

If you are on a tight budget, there is nothing wrong with that. You can get a Cooler Master 212 or another air cooler which will cool adequately up to around 1.35v on an i5 2500k. But then you are probably going to be running in the low to mid 70s 'C. And, that is only if you spend the extra cash for an extra fan (or 2) plus the cost of some quality thermal grease.

imo there is rarely a thing called 'too much cooling' (going below ambient temps being the exception). If you have the budget, you won't be dissatisfied with a top of the line cooler.

"It's a shame that you don't tell people that the reviews are only based on having the 2 stock fans on the H100"
Huh! 99.99% of reviews are done this way!
It's a shame you're telling people that air-coolers need thermal paste when it comes supplied and in most cases a tube no-less.
I'm not slagging your set-up..
I'm sure it works excellent for you but it's a custom set-up.
How many super cooler reviews are done with 3 140mm fans.
None!
Let's leave it at that!