Welcome to lomotion, scuteroo!
If you're planning to buy more cameras like the lca, fisheye no.2, or other classic cameras with hotshoe in future(which is very likely and which also means an external flash will come in pretty handy), get the 120N, the one with hotshoe and plastic lens. If not, the 120CFN will please you for now.
The characteristic of a Holga is the dreamy vignetting toy cam effect. So why pay more for one that's supposed to yield sharper images?
Hope that helps! 