Dress properly, and there's a ton more than that. ;>)maybe two months of summer but should be at least 4 months of cycling.
Don't wait. Prices may be down in the winter but where you are buying may not play that game and they also may not have your size left by that time. You won't get any deal if you need it ordered. Generally, you'll find odd ball sizes and demo bikes marked down in the winter.
I thought the same and decided to buy a road bike this year only for roads and buy a trail bike next year.. Spending money on bikes that do not specialize in anything is waste - Im sure many will agree that its better not to multipurpose bikes if possible.. Especially when I get a 2017 new $2100 BMC bike for 1100.. Was a no brainer.You keep dropping names of bikes that you could NEVER take off road, yet you say:
"I will mostly ride on roads but I want to take a little trip to bit of wilderness may be on uneven gravel roads.. I wont need those mountain bikes - Just easy non risky roding"
So, having said THAT, I'd suggest you either buy a cyclocross bike, or just cheap-out and buy some generic hybrid. None of those road bikes you listed should ever be driven on gravel trails.