I had a Joe Porper 2 X 4 leather case for 15 years. The leather looks as good today as when I received it as a present. The hardware has taken a beating over the years and my wife just bought me a new one for a birthday present. I received it about one week ago and am very pleased with the inside and the outside. It appears to be in the price range you stated and they have several capacities. Just have to look around.
http://www.wayfair.com/5280-Pool-Cues-34-Pool-Cue-Case-in-Burgundy-RM24B-OUO1020.html
I love Porper cases. The only downside is that they typically come with tapered tubes which means you have to put your cues in upsidedown and they can get stuck this way. However, I've ordered straight tubes from them before and they do this at no additional cost.
My everyday case is a custom made Whitten 2x4 but sometimes it's not a good idea to bring out. The Porpers are cheap, do a great job protecting your cues AND they're really light. They also come in a ton of colors.
In regards to the OP, every case mentioned thus far will do a great job. There are very few bad decisions and far more good ones when buying a case. All can protect a cue just fine. Some will last longer. Some will look better. Some are more comfortable to carry. You should look to spend upwards of $80 for a 2x4 hard case. Anything less should raise an eyebrow but don't necessarily dismiss it altogether. Just google a few reviews if you can. All of the custom cases out there are great but will often cost more than $300. Mine was about $540.