Hello, Zizo, welcome to the Cameralabs forums!
To answer your question, it would be helpful if you provided a bit more information about what you'll be photographing in specific. There are quite a few other DSLRs on the market today that may be better suited for the types of photography that you'll be doing, notably the newer DSLRs. Some of the newer entry level DSLRs from Canon, Nikon and Sony have much better imaging sensors than the older E-420 or the A200, plus a better feature set. I'm not too familiar with Olympus or Sony's models, but I'm pretty sure that you'd be better off with a newer model. What made these two models that you selected stand out from the others?
What's your budget for the camera plus lens(es)?
Gear: 7 Nikon Nikkor AI-S and AF-S lenses, SB-700 flash, Nikon D7000, Nikon FM, variety of accessories
"There are no rules for good photographs, there are only good photographs."
- Ansel Adams