So you don't have to pay top dollar for new equipment. A good lens is still a good lens. 2nd hand from someone that's had enough of photography and is wanting to move onto the next hobby. Saves a few dollars and loss quite as much for the good lens when ..... but hang on, you've not gunna sell anything. You can move onto your next hobby and still do photography.
Spend as much as you can afford on the lens. Regardless of what is said they do make a difference to the photos we take. The better photos you can take soon means you'll stay with this photo gig longer.