Fan upgrades-needed? (HAF X case + H100i CPU)

I'm looking at the build below with a Cooler Master 942 HAF X case. I'm not sure if I should consider upgrading the fans in it. Is it neccessary or beneficial?

The only available options in the configurator are:
Upgrade All Fans to Corsair Airflow 120mm Performance Edition (Up to 6 Fans) [+$89]
Upgrade All Fans to Corsair Airflow 140mm Performance Edition (Up to 6 Fans) [+$97]

The case spec lists this for fans:
Front:230x30 mm red LED fan x 1
Top:200x30mm fan x 2 (one is optional)
Side:200x30mm fan x 1
Rear:140x25mm fan x 1
VGA card fan duct:120x25 mm or 120x38mm fan x 1 (optional)
VGA card holder:80x15mm fan x 1 (optional)

So it seems to come with 7 fans of varying sizes, only 2 of which match the offered fan upgrade sizes of 120mm or 140mm.

I'm also looking at having the CPU cooler- Corsair H100i which has dual 120mm fans - do these take the place of and existing case fan slots?

I just can't see where any of the upgrade option fans of 120mm or 140mm would go in this case. Am I missing something?
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http://www.digitalstormonline.com/comploaddreadnought.asp?id=843776

Chassis Model: Special Deal Hot Seller - Cooler Master 942 HAF X
Exterior Finish: - Standard Factory Finish
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Processor: Intel Core i7 4770K 3.50 GHz (Unlocked CPU) (Quad Core)
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Power Supply: 1200W Corsair Pro Platinum Series with Corsair Link (CP-9020008-NA) (Quad SLI Compatible)
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Extreme Cooling: H20: Stage 2: Corsair H100i 240mm Radiator Liquid CPU Cooler (Extreme-Performance Edition)
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Thanks that does help a bit.

So... I'll have
Front: 230mm fan x 1
Side: 200mm fan x 1
Rear: 140mm fan x 1

Top: 200mm fan x 1 (plus space for another same size)- THESE WILL NOT BE USED - they shall be replaced by the CPU cooling fans: 2 x 120mm fans. What is don't understand is:
How can 2 x 120mm fans (those on the H100i) fill a space designed for 2 x 200mm fans?

Also, if I have a massive fan on the front, and the side, is the rear 140mm fan enough to extract the air they are blowing in? Or does the h100i fans/radiator unit also work to extract air out of the case? (since I wont be able to use the cases 200mm top fan)

Thanks

Edited by ScottishBattleAx - 27 Jun 2013 at 7:59am

In what way do you mean not enough room? I was picturing 2 x 120mm fans = dimensions of 120 x 240mm.

If the case top can take 2 x 200mm fans, it must mean the dimensions = 200mm x 400mm.

So... I thought the H100i fans of 120x240 would be small for the 200x400 space... and therefore, how would the rest of that space be used/covered up?

Ok I get you... I think we had a different understanding of what we were saying..

I totally understand there shall only be room for the H100i fans (2 x 120mm+extra), with not enough left over for a single 200mm fan. Like you say, there would only be ~150mm to left over.

So... the only fans on the top of the case are the H100i fans (2 x 120mm)

But you say the extra space is left open ? As in a hole where things could fall inside the case?
Surely it can be closed somehow? Sounds pretty rough if they just leave it open. Or I wonder if a 140mm fan could be added in (in addition to the 2x120mm H100i fans?

Thanks for your help. It all makes sense now!

I guess we remain unsure just exactly how Digital Storm attach the H100i's twin fans to the top of the case, but I get what you mean about the mesh that shall cover the entire top regardless of what fans are beneath it.

Here's a pic of the top of the case for anyone that may find it useful to see what we're talking about:

The HAF-X is good for air cooled systems, but, if you are going with a liquid cooler like H100i, I recommend the Virtue or ODE.

Those fans are an extra cost and don't come as standard.    You really don' t need them.   

All of those cases will do a great job at that, you don't really need a HAF-X to do that. If you were running some GTX 480 graphics cards in SLI, then I would recommend the HAF-X for air cooled high-end GPUs.

Any of those choices are great, pick what you like most.

What I meant is that you do not really need to worry about the case choice being HAF-X and how the fans are. All of the cases will do pretty much a great job.

GTX 480's were about the temperature of the Sun, that is why Alex mentioned them specifically.