Ok I gotta a 30D it's a nice cam. But am I am understanding you right here - you have an Olympus DSLR which you are going to use for tripod and studio use ? Why would you now buy a Canon DSLR which by comparison is going to be bulky and heavy and requires a whole new set of glass for use out and about ?
Buy another Olympus, share the glass and accesories you will have a great system that will be lighter and less bulky than the Canon.

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html