I am a US student with a fully funded offer to do my PhD in the UK and although was very happy to get the offer, the more I talk to people the more my enthusiasm is fading. Here are my concerns:

After I am done with my PhD, I want to get a teaching job in the US and I have had many people tell me that unless is Oxford or Cmbrige is very difficult - almost impossible, especially since the uni I got the offer from ranks in the mid 30's. So my main concerns: post-phd employment and university ranking - how much will these things genuenly matter?

thanks!!!