*EDIT* bah, lol. Maybe I should focus on replying rather than multitasking and eventually pressing Submit lol, everyone already started responding
The top choices right now tend to be the NZXT Kraken X61, Corsair H110i GT, and Swiftech H240X. I was eyeing the H240X myself when I said screw it and just picked up the X61 as here stateside I am looking at $170+ for the Swiftech unit (pretty close to custom loop territory where I came from, so almost making it pointless IMO for the 2-3degree benefit it offers when the X61 I picked up was $60 cheaper).
*EDIT2* Be weary of that CoolerMaster unit, reviews speak highly of it, but I have seen nothing but negative USER responses on it, particularly the pump dying and the need to flush it after purchase, which should not be something you need to do with an AIO.
Now, should you? That's debatable as something like the Noctua D15 will only be a few degree warmer than the AIO solutions I mentioned above, literally like 2-5degree difference. I personally have a Phanteks PH-TC14PE (performs similar to D15) and I decided to go AIO simply to clear up case space from the bulging HSF. Personal choice, nothing more, just keep in mind it costs. TC14PE here sells for $70, D15 $95, and the higher end AIO units $110 - $170 (and now EK's own AIO selling for $200+). So, it gets pricey, but at the same time it's personal preference.
- Memory, the 32GB may come in handy when working on large projects, might be beneficial for you in the future at some point.
- Monitor, yes yes, lots of choices in this arena. Personally I would go with the Dell over an Acer. The only Acer I would buy would be their 1440p IPS 144Hz panel, that's the only panel I would ever buy from Acer. They aren't a bad company, but they are known for their shoddy quality, probably a good reason why they can sell some things so cheap compared to others. Plus don't forget Dell's customer service tends to be pretty good.