A Giant Defy or a Roubaix would be good choice on the speedy race type bike. But It seems you may be more into a versatile exercise oriented bike. Although it’s a bit unusual, I like this steel Mercier
Save up to 60% off new Mercier Singlespeed Track Bikes - Kilo GX R20 - Save Up To 60% Off Brand new Bicycles . It is definitely no racing bike but it should provide a comfortable bike capable of rough gravel roads and even a few trails. But you have to get a bike that fits you so do your research and sit on a lot of bikes.