Because it's cheaper. The only reason I went with that 650w unit is because it looked to be on sale. A 450w unit would actually be enough to run that graphics card on if it were a good quality 450w unit, but at 550w it not only gives you a little extra headroom for thermal operation and quiet fan, but also for longevity AND if you should decide to upgrade the graphics card at some point, or overclock the graphics card or CPU, or add a bunch of lighting and storage devices, it would have enough overhead to accommodate all of that. So anything between 550-650w is plenty.
Honestly, Antec is stuck in the 90's when it comes to their case designs if you ask me. I don't even bother looking at their cases anymore because they simply look like they are ten to twenty year old designs and most of them tend to lack features that are commonly found on even budget case models these days.
If you want to spend that kind of money on a case, and getting a "silent" case is an important consideration, then I'd look at the Define R6, R6 tempered glass, Define S2, Define meshify S2, or even an older Define R5 or R5 TG. Or, something from Corsair or Phankteks.
Don't get me wrong, the P101 is "ok", and Antec in general has decent quality, but they always seem to be about five years behind everybody else in terms of including features like modern fan hubs, latest USB protocols on the front panel, they tend to be somewhat restricted on front panel air intake. Might be ok though if you can get a good deal.
The P5 is a micro case. You don't want that. The P7 is seriously restricted. I imagine that case has enormous heat issues when used with anything more than very basic hardware especially with big graphics cards.
I just, nobody really thinks Antec anymore when it comes to high quality cases or fans these days. That's because, they're generally not. Their power supplies, some of them, are still ok because many of them are built on high quality Seasonic platforms. A few of their units are built on Delta platforms, or at least some of the VP units WERE in the past. Now, I think they are mostly Seasonic and then some cheaper FSP, CWT and Andyson platforms that are not particularly good.
Honestly, in the the 50-80 dollar range, you won't find a better case than that Focus G. I know a lot of people who've used it and are very pleased with it for the price. I've built two systems in that case for customers and it was better than any fifty dollar case I've ever worked in before.
Personally, I think you're a lot better off no matter what kind of build it is to go with something in the 100 to 150 dollar range, but budgets don't always allow for that so when you need to shave some costs off, that case is a good way to do it, if you have to.
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