I should be doing hw said:
Does anyone have a Antec P183-V3 here? How would you rate it? I can't decide between that and a Fractal R3. Is there any news of an R4 coming out in the near future or should I not hold my breath?
I have that, and I like it well enough for a quiet system. However, I'd recommend the R3 in almost every case unless you want to put more money into the P183, or unless you have a fan controller with knobs (the R3's door lies pretty flat against the expansion bays, while the Antec's doesn't). The P183 is very solidly built, and I've heard that it cancels out noise a bit better than an R3, all things being equal (as it should, the thing is heavy as hell, good for dampening vibrations I'm sure, but it strains your back moving it around). The front USB3 support is nice too, though the cord is meant to go around back and plug into a USB 3 port, not a motherboard connector. However, I would think that the R3's ports / power buttons are more easily accessible than the P183s, being on top (though the P183 can easily be turned on with the door closed by poking your finger through one of the front fan holes).
The P183 does have some other flaws / extra work you have to do. The case has some cable management options, like routing things around the back and such, but it's more limited than modern cases in this respect and things can get tight unless you can do it pretty neatly. The R3 is much more modular, having the removable covers for the top and side fan slots, whereas P183 you would have to cover the top slot yourself. Speaking of slots, the R3 can also support much more fan configurations, having side, two top, and a bottom fan openings, if you decide you need more cooling. The R3 also supports two front fans blowing into the main chamber, while P183 has just one, and the Fractal allows the PSU to pull air directly from beneath the case (not a big deal, as the P183's separate PSU chamber will accomplish similar enough cooling). The default R3 fans I also hear are better than the P183's. The P183 also has two extra 5.25" bays, if that's important to you.
Unless you have a specific reason for choosing the P183 (USB 3, front fan controller spacing, amount of 5.25" bays, or extra sturdiness / potential quietness), I would go with the R3, which is more modern and adaptable. I would recommend it wholeheartedly if it only had space in the front for knobbed fan controllers and an extra 5.25" bay or two. If you are interested in the P183,
here /
here is how I managed my cabling in it.