You might want to ask yourself what do you plan on shooting? The answer might depend on where you plan on doing most of your diving. Primarily macro or wide angle?
A full DSLR setup is a significant investment and some people choose to start out with macro only setup or ambient wide angle seteup; and then start gradually adding ports, lenses, and additional strobes. Others might start out with the kit lens or something that goes from 17mm to 60-70mm for an all round range.
Don't restrict yourself to Canon lenses. Look at some of the Sigma wide angle zooms (17-70 macro and the 18-50 f/2.8 macro) and the Tokina 10-17mm fisheye.
Personally, my recommendation to someone starting out (budget permitting) would be a Canon 60mm Macro + Tokina 10-17mm fisheye + 2 strobes. The 60mm is a fab lens, letting you get up to 1:1 for closeups or fish portraits and the Tokina is a versatile wide angle lens with a nice added benefit of very close up focusing ability.
I am not that familiar with Ike strobes, but if it's within your budget, I think most people would tell you to get a couple DS 125's.
Cheers,