The limit on many of those bikes listed is low 200's to 240 lbs. There was a topic on here a few years back of a guy at 250lbs wanting a Roubaix. Just a fair warning ahead of time especially if you're going to be adding "touring" luggage or something to it.
I'd suggest an endurance geometry, endurance fit. Something that can fit 30/32mm tires. Then, I'd suggest finding a high spoke count cyclocross or gravel wheelset that'll take those tires. Maybe consider a bike that'd make bike touring better.
Also, spend good time researching and fitting a good saddle. Consider a local shop that does demos. For that length trip, your saddle and shorts combo are going to be super important for someone without years of riding routinely in their sit bones/hind quarters.
Not for speed, but for a resting place option......a set of clip-on aero bars. Set them up wide and comfy and conservative just to give a place to rest.
1000 miles is a lot for anyone. Comfort will ensure you enjoy the adventure.
Good luck and have fun.