Laptop RAM Upgrade Help

Hey guys!

I've been using my laptop for a bit, and I've decided that (TADA) it's time to get a RAM upgrade. I'm currently using 4 GB of DDR3 (Two 2 GB DDR3 RAM chips) but my computer can max it up to 8 GB. I'm intending to do exactly that. I'd like to keep it in the $50-$60 range.

I've never upgraded a computer by myself really, so I'm pretty much a newb at this techie stuff. From what I've seen online, replacing seems pretty easy.

However, my questions are simply...
A. What brands would you recommend?
B. How do I know if the RAM would work with my computer? (Both in size and technical)

Laptop Specs

HP Pavilion DM4
Model 1162 us


I also did a scan from crucial, this is what I got (If it's any help)
http://www.crucial.com/systemscanner/vie...E631D926C3

Thanks again for your help! ^^