It's a great option if you have a shelf full of K-mount lenses and don't mind missing some action shots, but the Pentax K-01 isn't such a great option for a typical amateur photographer.
While it's not the best in any particular aspect, and you probably don't want to use it for video, the Olympus PEN E-PL3 offers an excellent balance of size, features, performance, and photo quality for the money.
While the Olympus PEN E-P3 shoots out in front of its class for performance and holds its own on features and design, it's a bit expensive and you'll need to tweak its JPEG settings to get the most out of its images.
For some, an elegant shooter's design and high-quality low-ISO photos may more than adequately compensate for the Olympus E-P2's sluggish performance.
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The Olympus E-P1 is an otherwise excellent enthusiast compact camera hampered by some performance problems and the lack of a viewfinder and built-in flash.