Debian and Ubuntu will work on Intel Mac's.
My first attempts where with Ubuntu, which worked but I'm not that big of a Ubuntu fan. Reason for trying Ubuntu first: At the time I tried to install Linux on a Intel Mac (a few years ago), Ubuntu was the only one that booted out-of-the-box.
Currently my MacBook Pro runs Debian (ver. 6, standalone). My old Mac Pro used to run on LFS (multiboot with OS-X). Depending on how you want to install (standalone or multi boot with OS-X), there are many articles on-line to assist (serach for linux on mac intel).
If you want to run a standalone Linux version make sure you remove all the stuff installed by OS-X (including the partition layout).