The Canon 350D is getting a bit old now with it's 8meg sensor and small screen. There are so-called 'entry-level' cameras around now with better specs.
Loads of people have dumped them for a new bells and whistles 12 or 14 meg camera with super-wotsits all over and glossy wonders to gloat over..
Why then do hundreds of professional studios stil use them, though they were not intended for professional use, they were sold into the amateur market like most cameras are?
It's because 8meg is enough to get high quality 20x16 prints, the 350D has enough useful features on it and that camera just keeps on going like a solid workhorse, so why change it?
Studios are not money machines with money to waste.
You can pick one up for $200 from used equipment suppliers.
Most people who traded them in for a new super-camera will never be good enough to run a studio or have an exhibition of their pictures traveling the country and hanging in galleries but they still wanted a 'better' camera.
I've still got mine and I'm in no hurry to upgrade. There are 29 pages in this review.
That's because there's a lot of camera and dp reviews does a good job of it.
Look up other cameras too...see the menus
http://www.dpreview.com/reviews/canoneos350d
The lens focal length ranges you quote are for different size sensors so you can't compare them directly.
The DSLR has an APS-C size sensor and the Olympus uses a micro 4/3rds system sensor.
http://www.cambridgeincolour.com/tutorials/digital-camera-sensor-size.htm
To get macro buy a macro lens or use a normal lens with a bellows or close-up tubes. A lot of standard kit lenses have pretty close macro anyway and so do a lot of compact cameras, right down to 1cm for some of them.
For simple macro just put a close-up lens into the filter thread and use a high F number to get enough sharpness.
That's the cheap way in and you can get decent quality pictures when you know how to handle them.
http://www.cs.mtu.edu/~shene/DigiCam/User-Guide/A95/Close-Up/Close-Up-Lenses.html
Cameras are not photographers. Having the latest bits on them doesn't mean you can get any advantage from them if you don't know how to use them.
A lot of my close-ups, especially extreme close-ups, are done with an Exacta 35mm because I have all the equipment for it. It's over 40 years old and still churns out good results.
To convert to digital I can just run the negatives or slides through a scanner.
It has interchangable viewfinders and screens and you can even use a standard lens as a screen magnifier and use aerial knife-edge focusing without a screen at all.
There is a built in cutting knife for getting bits of film out instead of waiting for the end of the roll, and cassette to cassette take-up so you can take the film out in daylight.
http://www.wrotniak.net/photo/exakta/_img/x/ex-60e(02)-kopil-bel-x.jpg
Scroll down for more pics of the camera
http://captjack.exaktaphile.com/Close-up%20Page.htm
http://www.earlyphotography.co.uk/site/entry_C395.html
Here's an answer about camera quality. The camera buffs are obviously into cameras more than photography.
Laughable......
Have fun choosing a camera but don't bother with all the latest hi-spec stuff with it's high prices. You can get good results with less but you have to learn how to use the camera, however expensive it is.
https://answersrip.com/question/index?qid=20120129170541AA2GUDK