Roadbiking with SAG wagons?
With so many models out there i suggest. You go to your local bike shop and talk to the sales reps. Tel them what you want to do, how much you'd like to really spend. And test ride a few of their suggested models. Once you make your selection get out there and enjoy. I started riding again about 3 years ago and love it.
I've had good luck with a Trek 520. I did a solo ride from Georgia to Upstate NY in 1987 on the 520's predecessor, a Trek 620. It has an extremely wide range of gears, has a rear rack for saddlebags or a rack trunk, braze-ons for 3 water bottle cages and also braze-ons for a front rack if you wanted to add one. Check it out at http://www.trekbikes.com