i would never buy a H320.. cuz it costs almost as much as a full bloat custom.
169.00 price tag... add a bit more, and u got a full custom.
Anyhow OP i have a H100i, i needed it for a tight spot which a tower sink would not fit due to the PSU.
It does a fairly decient job at what it does, however i replaced the fans with scythe GT's, and toss'd the stock fans in my storage box.
The H100i is 89.99 as i write this on Amazon.
http://www.amazon.com/Corsair-Serie...?ie=UTF8&qid=1404502976&sr=8-1&keywords=h100i
The only thing im worried about is the pump life on the said units and i always make sure the RPM header is showing a RPM on the pump.
To answer your question also, if u can fit a 140mm class radiator, id go with that.
However 140mm radiator mounts are not available on all cases, so its pretty much a done deal if u decide to change cases in the future, unless u buy another one with a 140mm mount.
The 120mm mount however is widely available on a lot of cases, so the H100i will offer more flexability if u decide to change cases later on.
(provided your pump doesnt fail before that)
Anything more expensive then a $100 dollar price tag would lean me to move to a full custom while forking the extra out.
You can get used parts, to save some money, as used custom watercooling EQ, if maintained well, can last a very long time.
A review of the H220 (that's "two - twenty") -- a customer review -- suggested that the pump had low quality, although you'd THINK that the opposite would be true for Swiftech.
i wouldnt be surprised because gabe didnt use his direct drive apogee on these units.
They used to have a Direct Drive Apogee kit, which basically is a AIO with a fillable Rad+Res and its price tag was like 249.00
No one bought it, because, well at that price tag, you get into the Mid tier Stuff, and a full custom is a lot more fun to play with then a AIO.
The direct drive Apogee uses a Laing DDC, which would blow the AIO pumps away in both performance and durability, however, that unit itself costs more then a H100i complete.
http://www.performance-pcs.com/cata...t_info&cPath=59_971_498_493&products_id=34384
I have a Direct drive Apogee, and well, im impartial to it.
(i like it, and don't like it at the same time)
I will use it if i dont have a spot to mount a pump, however the introduction of the single 5 1/4 bay res with pump housing, completely makes it obsolete in most applications now.
http://www.performance-pcs.com/cata...oduct_info&cPath=59_318_660&products_id=31143