I had no intention of hauling around a huge DSLR either which is why I bought a micro 4/3 camera a few years ago
It looks like you can get the PEN for fairly cheap:
http://www.amazon.com/Olympus-E-PL1...BRJO/ref=sr_1_1?ie=UTF8&qid=1332363205&sr=8-1
Keep in mind that you will need an external flash. It is not complicated, you just put the flash on and turn it on, and the camera knows to use it. (I find the external flash pointed at the ceiling will get far better pictures than any on camera flash, and you really only have to carry it if it's dark out) Something like this should be fine:
http://www.amazon.com/Polaroid-PL-1...r_1_13?s=photo&ie=UTF8&qid=1332363659&sr=1-13
I would not get the Olympus brand flash because you can't point the light at the ceiling and that is really a very easy way to make pictures much nicer.
It's also a good entry into DSLR if you want to start to learn how to use manual settings and get really great pictures!