Canon 60D vs T4i

The 60D is your best choice, great tool. Buy it with the 18-135mm kit lens because it covers a lot of the kind of pics you usually take while on vacation, it gets you closer to say, birds or to take that wide shot of the beach. It is a nice starter lens. 

I just answered the exact same comparison question so I'll copy and paste my answer here.

You need good glass (invest in a L-series lens) to really get the images your looking for. The 60D is a great camera, I've owned two of them in the past, and to be honest with you, it and the T4i are virtually the same camera. The firmware on the T4i is a little nicer and the 60D is just a tad bigger so it feels better in my hands and minus a few minor differences, both cameras will give you a quality image.

My biggest "aha moment" with photography was putting on an L-series lens on my dslr. Now mind you, good lenses are quite expensive, but I've witnessed too many people giving up on photography because they made the leap of purchasing a prosumer camera, but didn't think to put on a pro lens. I could even make the case that you would be better off downgrading to the T3i and saving up for some quality glass.