Bleudragon made a very good point about comfort. Visiting a camera shop, that will allow you to hold a camera for a while, and really work the controls for a bit, is a good idea. Comfort trumps most other factors, as an uncomfortable camera will be left at home, and not enjoyed much.
Your older lenses will get you started, but the wider one is not very wide-angle, considering the 1.6 crop factor, caused by the smaller APS-C sensor. The Canon 5D models have larger sensors, the same size as a 35mm film negative, which will give you images that will look familiar to your eyes with your existing lenses. A pre-owned pre-Mark II 5D can probably be had for less than a new 60D, but it lacks such things as the self-cleaning sensor that became a regular feature starting with the XTi/400D and 40D. The 5D Mark II is, of course, far more expensive than a 60D.
I bought my pre-owned 5D recently, for $900, after carefully considering images posted on-line, including side-by-side comparisons posted on another site. Do be aware, when evaluating a pre-owned 5D, the images reviewed on the LCD will look very poor. LCD technology has come a long way the last few years!
Canon 5Ds R/7D2/7D/5D/40D/1D2N/M3; Nikon F6/D3s/D700/FM3A/1Dx/Coolpix A. Lens selection changes often; some of my favorites: Zeiss ZF.2 2/135 APO, Canon 100mm f/2.8L Macro IS, Nikkor 14-24/2.8G and 24-70/2.8G.