Hey, so I am kind of new to road bikes.
I rode this mountainish bike for about three years commuting to school everyday. I want something that is faster. There is hills where I commute and I want something that is able to get over the hill fast. I will be mostly riding on road/pavement.

I am around 5'5" ish and I am looking foward to buying a bike on craigslist. However, I don't know a lot about bikes like parts and stuff. From what I gathered over the last two weeks of browsing on craigslist is that there are old (vintage) bikes and relatively new bikes. Titanium is hella expensive and carbon is pretty expensive as well. I want something that is durable and won't break easily like those really thin frames. I also want a bike that will last a long time and is not a entry level bike. I want something that I could use until I get enough money to buy a really hardcore good bike.

What should I be looking for when I'm browsing on craigslist? (brands, parts, etc)
P.S. my budget is like $360