best case under 150$



By definition, those are the best cases for you.

Cases are a personal thing.
So long as it is large enough to hold your parts, and has decent cooling it will serve.
What makes a case really good is that you love it.
You will be living with it for several rebuilds.

That said, here are a couple:

1) Antec 300 illusion. a thousand reviewers can't be too wrong:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129066

2) I have always liked the Antec SOLO as a quality quiet case. The SOLU II is even better:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129177

3) If your motherboard is M-ATX, then the Silverstone TJ-08E
Is a fine case:
http://www.newegg.com/Product/Product.aspx?Item=N82E16811163182

4) For build quality, look at the Lian li cases.