Should I even bother with watercooling my G3258?

Dude13450

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I know most people will say no just by hearing the word "Pentium" but hear me out. Most people seem to universally claim that the stock cooler for the G3258 is good for up to around a 4.5GHz overclock; however, from what I've seen, most people can barely touch 4GHz-4.2GHz on the stock cooler without having stability issues. I will more than likely NOT be overclocking that high, as most games I intend to play will play just fine on ultra settings at 1080p with a 3.8GHz overclock.

My concern is that I am building a mini-ITX cube PC, mainly because of lack of room. I have literally have no physical space for a huge tower (even mid towers run a little too tall and deep). My main concern about it is that once the build is complete, there is already very limited space which creates a restricted airflow. I feel that a cheap watercooler (Corsair H50/55/60 or Cooler Master Seidon) would not only free up precious airspace but also give me better temperatures. My only other concern (which is not really a problem) is that I believe ridding myself of a huge fan/heatsink combo would also look much cleaner.

My build is as follows:

Pentium G3258
ASRock B85M-ITX
G.Skills Ares 8GB DDR3 1600 (2x4GB)
WD Caviar Blue 1TB 7200rpm HDD (also had a 120GB SSD that was removed for budgetary reasons)
Gigabyte Windforce R9 270 (downgraded from a 280 for budgetary reasons)
Corsair CX430 semi-modular PSU
Fractal Design Node 304
Total price: $533.81 (or 589.01 if I add a watercooler) -- have my own OS.

I should mention that I am trying to keep my build under $600 or as close to it as I possibly can.

Should I add a watercooler or do you think it's pointless with my build?

(EDIT: Prices are actually $509.32 and $564.52, respectively)
 
Solution
A closed loop cooler would help keep the rest of the PC cool as it dumps the hot air outside the case unlike an air cooler. For what you want it sounds like a good option

Dude13450

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The cases stock exhaust fan is a 140mm, so I'm sure it'll fit up to a 140mm radiator, though I will probably stick with a 120.
 

Dude13450

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A Hyper 212 EVO is not going to fit into a mini-ITX cube case; hell, they don't even fit or just barely do fit in most microATX and mini-ITX towers.
 

Dude13450

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That's a load of bull. If you overclock the G3258, the only thing that the I3 will win on is the fact that the I3 has hyperthreading (this is not the case with other Pentiums, though). I should probably mention that I won't really be taking advantage of the I3's hyperthreading with probably around 95% of what I plan to do on this PC. That 5% chance that I may use hyperthreading is not worth the almost 200% cost of the G3258 ($65 Pentium vs $120-140 I3).