I only got the bundle about a month or so ago and after modding I've got my CMBO to look near as good as CMBB and in some cases better!
I think CMBO is an amazing game on it's own and if your are into the western front, you'll be set.
As for which mods to get, oh boy, I asked the same question when I came on.
Get CMMOS and figure it out, and then download ALL the mods for it and pick and choose your way.
I did end up making a few custom mods based on others to suit my taste, but that's just because I got really into it!
Anyway, CMBO is tons of fun so enjoy your new addiction!
Jordan