Well, I doubt you need 5, or even 4 fans - I would try one in front and one or two in back to begin with. I love front fans but there are down sides to them. Since they are right up front, you may hear them. Antec fans are generally very quiet so I don't think that will be an issue, you will probably hear the CPU and/or graphics card fans over the front fan - even chipset fans can be louder. The biggest downside to front fans (actually, to any fan the pulls air in) is they tend to suck the dust out of the air and drive it into the case. Whereas exhaust fans pull air in from all the case openings so the wind forces at any given spot is less. So, I recommend you open the case and inspect for dust and dirt monthly, and clean as necessary.

Then, ensure your next case has a washable front air filter.

I'm going to stick one of the four I ordered in my sisters computer anyway, that has no issues but it needs a case fan because that didn't come with one either.

Do you not think I should use a fan at the top of the case, just front and back? Thanks.

Certainly, if your PSU can handle it, one on top can't hurt. But you might want to try just the two, one in front and one in back and see how your temperatures run. The only issue that would concern me (besides PSU connectors, but that's minor) is noise. You already have at least 2 fans making noise (your PSU and CPU), and if your motherboard chipset and video card has fans, that's 2 more. If you have more than one computer in your room/office you can easily have 10 - 12 or more fans spinning. That's gets old.