Budget: > RM2k ? typo maybe? because it can also mean that u can spent up to rm10k..lols

of course up to today, there are various generation of Olympus PEN.

the latest generation consists of Olympus e-p3 (high end), e-pl3 (medium/lite) and e-pm1 (mini/consumer low end)

basically all three use the same sensor and can be said the quality also has no different, if i'm not mistaken. The differences are only in certain physical factor, like extra direct buttons, dial buttons,touchscreen/tiltscreen etc and in software, almost no difference.

micro 4/3 sensor is basically the same size with the 4/3 sensor, they just remove the mirror and make the flange a little shorter,thus producing PEN series.

micro 4/3 sensor,compares to others like APS-C, main difference is the size. you can see it clearly with this comparison picture

if u prefer more buttons with extra touchscreen, go for olympus e-p3 ( costs around rm2700 with kit lens )
if u prefer tiltscreen, go for olympus e-pl3
if u prefer simplicity,more like compact camera, go for olympus e-pm1

for better indoor shooting, i recommend u get an external flashgun like metz 48-AF

but if u prefer no flash (due to weight or sumthing), get the Panasonic 20mm 1.7 (rm1450) but i've heard that the autofocus is not so impressive. but if u are shooting still static indoor, it should be no problem.

if u have more budget, certainly go for Panasonic Leica 25mm 1.4.
if u can live with a bit longer lens like olympus 45mm 1.8, this can be great lens too, only rm1k

the crop factor is approx 2.0 for m4/3.. meaning that 14mm lens in m4/3 is equivalent 28mm in full frame.

usually the kit zoom is 14-42mm (28-84mm equivalent)...
Lenses can used among oly and pana....
however, certain features wont work (non-essential ones)...

i know my e-pl1's TTL flash wont work when i put 20mm f1.7 on it...

the oly kit lens 14-42mm is not slow in term of Autofocus but i meant with slow Aperture f3.5-5.6.
for autofocus, it can be the fastest,even comparable to high end DSLR with good lighting condition.

all m4/3 lenses are interchangeable.

for example, right now i'm using e-p3 with panasonic leica 25mm 1.4

u can also use any other lens using adapter (manual focus only of coz)

I vote for gf 3 or oly epm1 if you wan compatibility. And if you love manual focus, get an adapter par with m 42 lens. Cheap and nice quality.

I am using Helios 58mm f2 now