I bought / built my first ever road bike last autumn and I really enjoy road riding, it adds a whole new dimension to my offroad riding as well as the benefits of additional strength and stamina (which is why I started).
As for size and manufacturer, go to your LBS and try a couple of bikes for size, as reach is important for a road bike. I ride a smaller sized frame than convention says I should, and have ridden hundreds of miles comfortably, so regard any size chart as, at best, a guide.
Deciding which make to buy is as difficult as deciding which make of mtb to buy, and as I ride a Raleigh I would consider them a “proper” manufacturer, although they still have a lot of catching up to do. Fashion plays a huge part in the popularity of certain brands, so a cheap bike is not always a bad bike, just not popular. Of course, it could be cheap because it’s a complete dog….. so caveat emptor.