I remember Pete seeger talking about making that long neck so his Bass string could be in E so he could play along with the blues guys.. Play around with it and you'll find just the right thing . F and E are both possable.. I tuned my ramsey down to F sus 4 to play shady groves in the studio this year and it is not a very long neck.. You have alot of choices in front of you and non of them will take you very far wrong.. To loose and the instroment will buzz and to tyte and you will break strings (and possably hurt the neck) . F and E wont be far a feild at any rate.. Good luck !!! All the best Guy