WOW! So many options!
The Trek 1000 will be a fine starter bike. Once you ride it for a couple of years, you might want to upgrade, but it will be fine to start with.
I had a Trek 1000 I rode for 4,000 miles/2 years.
Now, the components are lower end ones and need to be adjusted on occasion (by a bike shop if you don't know how)... but otherwise it's a solid bike. $300-350 is a good price for it.
Go for it.
Good luck!
"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!!!!"