Hi Christopher and welcome to the forums.
Well let's clarify something before we go any further. These two cameras are aimed at photographers with two entirely different levels of skill amd understanding. You see, the Canon 550D is an advanced entry level DSLR, ideal for someone to learn the basics of photography with, whereas the Olympus E30 an advanced serious enthusiast's/ semi-pro level DSLR, used by those who understand how to use a camera fully and want to exploit the power of what is possible with the ultimate control. So what has made you choose these two particular camera bodies over all the other possibilities?
Right, I have another question for you. Why have you chosen telephoto lenses to go with either of these two camera bodies? What are you hoping to photograph with your new camera, because a telephoto lens is only used for shooting certain things? It's not what you would class as a universal lens that you would use more generally.
Now to know what camera and lens or lenses to recommend for you we are going to need a little more information from you to help us narrow down the field. We need an idea of how well skilled at photography you are, as in are you a complete novice or have you been using film SLR cameras for the past 20 years and are well versed in the all the terminology and highly skilled in photography? Secondly, what are you going to be photographing? Do you like to take shots of the landscape, or family portraits, or wildlife or perhaps fast moving sports? Or are you going to be doing a little bit of each? Next, if you have been using a film SLR camera for many years, what make is it and have you got a lcollection of lenses for it and finally, what budget have set yourself to get you started?
So before you make your final selection you need to establish answers to all these questions and decide what you camera you will need and what other equipment and lenses you will need to add over the coming years. Take a good look round at what is available within your budget and start to make a shortlist. Then go to a shop, not to buy, but to handle each of the cameras on your shortlist. This is fundamental in the decision making process, because each camera will handle differently. With some cameras, you will find the controls are just all wrong for you, as in becuase of your particularl hand size some buttons or dials will just be badly placed or too small or fiddly that you can't operate the camera with ease. However, another may just perfect and you will also like the way the camera's menu sytem is set out too, because the less you have to think about how to set up the camera for each shot, the more time and effort you can put into capturing the perfect shot. Once you've found a clear favourite, then have a look round to see what deals and bundles are available and if you're happy with the vendor, then it's time to make your purchase and get out there and start shooting.
I must emphasize though, that we can not tell you which camera should go and buy, because all our needs are different and only you will ultimately know which camera set up is best for you!
One thing I will add though, is that all the current entry level cameras offered by the major manufacturers are capable of taking superb quality still images, once you know how to get the best out of it, so don't be put off by any particular brand for the moment. You will generally find that if you choose an Canon or Nikon camera you will have the greatest choice of additional lenses, though you will still be able to cover the entire focal length range with the likes of Olympus, Sony and Pentax too.
So best of luck and we look forward to reading the answers to the questions above.