I own a Trek 1000, 2006.
I have put around 4,000 miles on it thus far. It's a great starter bike and will do you good.
The gearing is a little picky... and you will need to find a mechanic who knows how to find the sweet spot on the derailer...otherwise... it's pretty good.
If you can find a bike with Shimano 105's on it... that will produce smoother shifting... but if you are looking at a used inexpensive road bike to put a few miles on it weekly.... the Trek 1000 will do you just fine. How much are you going to pay for it? I wouldn't pay over $400 for a used one... just because you can find a new one for around $550 (end of year sale) to $600.
Like I said, I have ridden MANY miles on mine... and a few 70-80 miles rides. It is a great starter bike and will treat you very well. The only work I have had done on it is new brakes, new tires, and of course tweeks on the derailer.
Now, after 2 years though... and working harder than others riding better bikes... I am DROOLING for a new full carbon road bike- all Ultegra components. The wheels on my Trek 1000... well... let's just say EVERYONE flies by me on a downhill. Good little bike... but I'm ready to keep up with the big dogs.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"