this was my first mountain bike. Bought around 1990 for $550 on sale. That was a big purchase for me back then. I loved that bike.
My new mountain bike: Marin Hawk Hill, bought last year. I think I paid $1300. This bike is also considered "entry-level." I'm still figuring out the full-suspension, but I can see keeping this bike a while; maybe upgrading the gearing (need a bigger cog on the cassette) and getting lighter wheels, better tires.
For my road bike, I had a Trek 2.1 for years. It has an aluminum frame, carbon fiber seat stays and fork. I paid $1100 in 2010ish. I changed the groupset to a SRAM Apex compact double with a 15 (or 16)-32 cassette, and upgraded the wheels, so I probably spent about $1000 upgrading, but not all at once. I've done all kinds of great and tough rides on that bike. The only reason I have a new road bike (Specialized Amira) is that when I was shopping for a mountain bike, I spotted the Amira in the front of the shop and asked the salesperson about it. It is bright orange and someone bought it for his wife and returned it because she didn't like the color. I tried it, it fit perfectly, and I got an almost $1000 discount.
Last summer was "new bike summer." Now I need to get riding and figure out how to ride a full-suspension bike.