I have a new Imac 27" loving the performance not happy with the internet.

Couple of issues.

1 I have a Airport Express several years old. Light is green but no access to internet. Some days it works great all day then some days nothing. I don't think it is ISP. I am going to swith everything to WPA. Should I reset the AP Express?

2 I bought an airport extreme. It is still in the box my wife thinks it is redundant but I want more stregnth and my stereo is not in the room where the cable comes it. Would you keep it or get another AP Express for a bridge.