Choosing the best distro.

Hi all
Help me find the best distro for the following configurations:
Intel pentium IV 1.6 Ghz
128 MB RAM :frowning:
40 GB Hardisk with one very big partition more than 35 gb n another 2 gb partition.
windows xp is already installed but has enough free space (26gb).

Which linux will be easy to install ? I want to suggest for a beginner. I myself use ubuntu 10.04 on my laptop but the recommended RAM is 512 MB. havent tried in a comp with such low RAM.