If you're still agonizing over which mid-range DSLR to purchase, perhaps ePHOTOzine's 2009 DSLR Group Review Report might help.
The article compares 5 DSLR bodies: Canon EOS 50D vs Nikon D300 vs Olympus E-30 vs Pentax K-7 vs Sony A700.
The A700 emerged as the overall winner, with the following verdict:
The Sony Alpha A700 wins because of the specification being so similar to the other models, it gives good noise performance, has great color rendition and a good dynamic range that seems to work even when dynamic range compensation is switched off.
A useful summary of pros and cons of each camera is given at the end of the review.
Olympus E-30 vs Panasonic Lumix GH1 – Steve Morgenstern:
The Olympus E-30 is priced at nearly $1300 without a lens or a video recording function. It offers an articulated screen and some advanced features, including two control dials to speed manual exposure settings and extensive customization options. We also like some of the fun features for shooting and in-camera image editing. Both cameras have issues with image noise (they have the same size sensor). Superior resolution, color accuracy and burst rate results give the Olympus some crediblity, but overall the Panasonic, with its exceptional Live View performance and first-rate video, is a better buy.