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!