Isn't burning DVD-DL (Double Layer?) disks is the same as normal DVD's but it's like 2 disks on one platter?
Anyway, if you say you will only be using it for coding and surfing or something, no gaming or hardcore video editing, then you really don't need an i5 or a quad-core or any hardcore CPU with massive speeds.
I am doing the same thing as you described with a 3GB ram, 2.13GHz CPU, 256MB video, DVD burner, nice touchpad, very comfy keyboard and a nice design.
I am very much satisfied and I got it relatively cheap - it was on sale when I bought it.
Not being able to play awesome games makes me focus on coding and other work... for games I have a PS2 and a PSP