I had excellent luck using inexpensive Chinese-built adapters purchased through E-bay to mate my Olympus OM lenses with a 4/3 format DSLR. I also found some real accessory bargains to enhance my new DSLR's usefulness.
Click on the link below the photo to read about my experiences.
I had a problem with my OM lenses on my NEX. The adaptor is thicker than the m4/3, allowing you to accidentally press the release catch on the lens making it drop off when focusing or attempting to change aperture (on non-Olympus lenses). Or even just holding the lens. This happened too many times so I sold them.
A DSLR is one way to go and I had several, but since getting the Sony A6000 I have sold all but one (pentax K10d) as the Sony does everything and is a great advanced compact too. I can use my Leica lenses with it for a really compact carry round kit.