Hi Rafa
I still think that using a traditional RAW workflow:
Raw file - converter - tiff file - product
is a horrible way of working (I should know, I did it for years).
The two pieces of DAM software: Lightroom and Aperture (and to a lesser extent Capture one). Save the changes you make to the RAW files in either a sidecar file (Capture one and ACR/Bridge)) or in a database (lightroom and Aperture). It means that you only need to keep one copy of the RAW file - only using output when you actually need it for a web page or a file for a client.
I'm sure that you should at least think and examine going down this route before you make any decisions.
Deciding how to do your RAW workflow is really quick and easy - changing it later is really slow and difficult.
The fact that neither lightroom or aperture yet support the E-P1 is not very relevant - I'm sure that they will (at least, lightroom is a certainty). Capture one is going to as well.
You could, to get you going, download the 30 day capture one trial, do the easy hack to get it to read the E-P1 files, by the time it's expired there should be more choices, but C1 does a grand job now.
Personally? I use Aperture - and with cataloguing for 24,000 images changing now would be a horrible job, still, it's only problem is slow support for new cameras.
Take time to make up your mind!