Thank you all for the very detailed replies!
That's my situation right now. I'm leaning more towards the F8, because I haven't been in need of the +4dB output, and I don't really feel it will come soon. Until now, my only use for the outputs was to make a wireless camera hop. I choose the Sennheiser SK / EK - 300 model, for a scratch track.
For now I'll be renting all my wireless systems, so I can choose my receivers output level to my need (limitation). I'll be using it the most for mic level inputs.
So thank you very much everyone! I think I'm buying the stuff today. Wish me luck for not getting caught in buying triple of what I needed without having the money.