There is literally a world of difference between a $1000 bike and a $3000 bike. A $1000 bike will usually be aluminum or steel with lower end components for $3000 you can get Ti or Carbon with at least Ultegra.

I agree, first ride decide if you like the sport and then if so, by all means plan on spending $3000 and get a good bike. Spend the time while you are riding and deciding to visit bike shops, check with other cyclists, join a club and ask questions. Don't rush the decision. Take your time. This is even more important than buying a car!