Don't go for a FF unless you are a serious shooter. I think you should stick to 60D/T4i if you don't spend much time on photography.
The T4i has higher ISO range but the difference is very little.
And about the 70D, it will be very pricey for first few months. At that price or less you will easily get a used 5D markII.
I'm not serious shooter, just a dad with 2 kids. I shoot with 5D III and my little P&S is RX1.
Higher ISO range doesn't mean cleaner image in lower light. It's all about sensor size - you will have more water when carry bigger bucket.
I know people who have txi (what ever number you want 1-4) who are serious shooter bc they are always taking pictures. Others is 5D mark ii and iii who aren't they just need to have top of the line stuff.
If this is your first DSLR, I would say just pick up a used 60D, see if you will use one. I know plenty of people who got a dslr and like the P&S better bc they take it places.
You can always sell your 60D again and probably only lose $50-100 in a few months.
From Jan 1st to March 20th 2013....over 7K photos were taken with my 5D III and over 2K with my Sony RX1. Can you define the number of photos that txi owners shoot with their cameras? Since you mentioned "I know people who have txi (what ever number you want 1-4) who are serious shooter bc they are always taking pictures"
Don't take offense. Some people make assumptions and they don't realize how ignorant they sound. I took 500 pictures of people running today and the worst part is that I now have to look through 500 pictures of people running. It doesn't matter what body I'm using or how much disposable income I have... or how I got that disposable income.
Having said that, I have slowly built up my funds, lenses, and bodies via upgrades. I started with an XS, kit lens, and a 75-300... and that was 4 years ago... or so... and in a few months I'll have a 5d mkiii, a 24-105L, a 100mm f/2.8L, a fisheye lens, a 50mm f/1.4, a 135mm f/2L, and a 70-200mm f/2.8L IS mkii (if I'm lucky enough to find a deal on the last one).
I'm not a pro, and most people don't want to hear the long story of upgrade and buying and selling equipment and making $20 here and $30 there...