I think there are a lot of hybrids that will meet your criteria, and even at your price. I would recommend the Giant Roam 3 or the Giant Escape 2. 2017 models are selling for between $415 and $435 on Giant.com (same price, I would imagine, as at a local Giant retailer).

If you think you'll favor more trails and/or like a more upright position or want the front suspension fork, the Roam is a good option. It comes with a solid 8-speed drivetrain (with 3 chainrings in the front) with Shimano Acera-level components. It has Tektro mechanical disc brakes, which will work well.

If you think you'll favor more road or pavement, the Escape is a good option. It has a very similar 8-speed drivetrain (again, with 3 chainrings in the front) and Shimano Altus-level components. It has Tektro linear pull rim brakes (often called V Brakes). Again, these will work well for the intended use of the Escape.

Those are great new options. I'm a huge fan of buying used bikes, but I like to tinker and I have a basement shop where I can fiddle with and just them. Used bikes almost always will need some type of tune up or parts replacement to make it good for your use, and this can take special tools or experience, depending on what it is. Knowing that you don't want to do that up front is great -- you can avoid the potential pitfall of something you're not going to want to be doing. You can save a lot of money on used bikes, but you can also find pretty bad values out there also. You also certainly have less choice of frame color and size on the used market -- what you see is what's available.

At least with new, you usually have the choice of frame size and sometimes also color (less likely if you're buying a year-end closeout, though). You also often get free tune-ups and adjustments from your local bike shop with the purchase of a new bike. If your local shops don't sell Giant, no worries -- everybody makes the same style of bike as the Roam and everybody makes the same style of bike as the Escape. Giant usually offer some of the best values in the industry, but you can get those types of bikes from anyone.

I would not recommend buying from the internet unless you've already ridden something you like and you know exactly which model and size you're looking for. I would say that most bikes at Dick's Sporting Goods are one step up from Target and Walmart, and one step down from a bike shop bike. We looked at various Diamondback and Nishiki models before we bought a Raleigh from our local bike shop last summer for our daughter. The Raleigh is a base model (Alysa 1, basically Raleigh's version of the Giant Escape 3), but it felt like it had better material quality than the Diamondbacks and the Nishikis. We paid $329 for that Raleigh, and it's a great bike -- she rides it all the time.

You CAN get very serviceable entry level bikes from your local bike shop. They don't have all the sexy parts on them, but low cost doesn't always mean low durability. In fact, some of the lower level components are sometimes some of the most durable (though generally not the most refined).

Good luck!