Ok, so let's clarify some things and put some recommendations in place.
This is going to be a high end system. Big GPU card. Big CPU. You want airflow. You want an "airflow" type case. That generally means you want something with either significant surface area openings on both sides of the front panel AND the bottom, or a full mesh front. I prefer a full mesh front in most cases, but sometimes there is a case, like the Define R6 or S2, that has good enough airflow as designed. Those do have meshify options, but I DON'T personally like the angled design of the meshify front panels. Supposedly it is engineered so that the specifics of the geometric angles on the mesh significantly cut down on noise levels but I am skeptical and having custom modified my own older Define S, I really don't think it's necessary anyhow.
So, that case, the 275r, is really NOT a good choice anyhow no matter how you look at it. Yes, it LOOKS ok, and it's inexpensive, but it's a turd if I'm being honest. It has very little aiflow through the front panel and that is going to make a huge difference because no matter how many fans you put up front, in back or up top, it's still going to be seriously limited when it comes to the air path.
If you are committed to a case swap, then you need to convince yourself that it's going to cost more than you wanted. Otherwise, you are wasting your time and money. You are not going to find a case that is REALLY suitable for the specifics of this build for less than 75 bucks really.
If you want a cheap case, this is by far the best "cheap" case out there.
www.fractal-design.com
Otherwise, plan to spend a bit more. Consider, the case is just about the ONLY piece of hardware in your entire build that for the most part is likely to be used from build to build, through many upgrades, regardless of age. Unless you grow bored of the case design there is rarely a reason to change cases later on, ever, so long as you make sure you get a case you REALLY like from the start that has ALL the features you might ever need or want, and the priority for a case should be
1. Quality. Cheap cases tend to warp, break, fall apart, bend or just plain deteriorate over time. Good ones don't.
2. Features. Cases with acrylic side panels tend to end up scratched, cloudy, cracked, warped or otherwise discolored over time. Tempered glass does not. Short of breaking it, it will pretty much look the same in ten years as it does now. Also, airflow restrictions, internal impediments to airflow like drive cages that are directly in the air path, few grommeted pass throughs for cable management or very little room on the backside of the motherboard tray for cables to be arranged and layed out of the way and also for drive mounting which has become common on a number of cases, are all considerations. Filtration is another. There is little need for filtration to be anywhere other than in the front and under the power supplies intake vent. Top filters are mostly just unnecessary because you have no reason or need to filter dust out of air that is LEAVING the case, unless you are simply trying to purify the air in the room. LOL.
3. Looks. You're going to (Probably) be living with this case for a long time. Make SURE it is what you want. These days, there is more than just tempered glass, construction materials and how it actually "looks" to consider. Many cases might have integrated RGB lighting, specific fans, etc., but I wouldn't base my case choice on that. Most included fans for practically all cases, are lower end models. And RGB can always be added if desired.
That 275r is a fairly old model. It lacks a lot of modern features and has poor airflow. My advice would be to avoid it.
I'd look at some of these, for starters. Should probably add Be Quiet to the list of halfway decent case manufacturers as well. I don't particularly like Antec. They used to be good, back in the day, now they just copy everybody else and use cheap gimmicks. I'm not a fan of NZXT either.
Primarily, newer models by Corsair, Fractal Design, Phanteks, Lian Li, Be Quiet, few others. I'll make some specific recommendations for you to at least give you an idea of what is a good choice these days when I get back after while. Gotta go see the orthopedic surgeon about my suddenly hurting knees. LOL.
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