I just brought my cheap hybrid bike that i bought from target to NYC, making sure i didn't spend too much until i was sure i wanted to get into cycling in the city. it turns out the cycling here is great because i'm right near the palisades. i would like to really get more into it and ride a lot more, especially longer rides, but i feel like my $200 hybrid from target might not be the best to do that. i went out for a hilly 21mi yesterday and i felt like i'd put my bike through a battle, and my body, and i'm in excellent shape. i'm in medical school so the decision to get a real road bike is certainly tough on the budget. is it worth it? will i get injured down the road if i keep riding a bike like this on long rides? are there cheaper bikes out there that are good for beginners but won't drain my budget?