if it is a gaming case, here are what i would suggest
1: antec 302 (usually 54.99 but price may have gone up a little)
2: corsair carbide 500R (around 120 dollars)
either case is great but the 500R is more premium. doesnt mean that the antec 302 has bad build quality because its about as good as corsair from what i experienced.
a nice monitor is the asus pa238q. its a IPS panel meaning better image quality and better angle viewing. they sell for 229.99. if that is too much, the asus vs228h-p is another great choice. its a TN panel which isnt as good but still has great image quality. they sell for 139.99
the pa238q has a much better design. its also pre-calibrated for color accuracy from the factory (although not as good as doing it yourself). the pa238q has a great stand that is full adjustable for your needs. better off with the pa238q
i have the QR version which is the same panel but without picture in picture, a displayport cable, and a couple of other software features. the QR has a game mode though
i rather trade picture quality over response time. i used the QR and the VS and they are pretty close in day to day use since asus did something with their TN panels so that they look better than most other TNs and have a slightly larger viewing angle. they are close but to a professional or a serious user, its completely different