Problem In Server

have some clients projects, for doing that project I buy server but my raid card is troubled. so, I wanted to buy the new raid card which suitable for any servers. one of my friends had suggested me to buy raid cards on Amazon or eBay. If you know the another way to buy the best raid cards in the server can you please suggest me? I have another if you know the answer please answer this question also raid cards will support all application in the server. please give me the answer as possible as soon.

 

Who was the manufacture? CDW.com is a good supplier.