which memory?

[titan131]

hi I am looking at two budget memory kits, both 2x2gb. One is 1.8 to 1.9v and the other kit is 1.5v. The 1.8-1.9v comes with a 5 year warranty while the 1.5v kits doesn't come with any. What are your thoughts, which should i go for? this is for a amd am3 build btw