I think if you are rolled for nl10, you should start there. It's not very tough imho, but it also depends on which poker room you play. For example FTP or Stars are much tougher, than Bwin, but you can also make a solid winrate there with a basic strategy.
I also started CG after playing SNGs. I started at nl10 with 150 BIs (LoL

), played one month, than moved up to NL25, cause I was alredy rolled for that (60 BIs).
How many BIs do you have for nl10?