Nobody I know with a Garmin 296 or 396 has any regret of not having an FMS. The really odd thing is that I see these handheld Garmins even in aircraft that have already got God's Gift to FMS systems, or any other GPS system except a Garmin 530 or 480.
I agree with SASless, I'd go Garmin, probably 296 if I wasn't in North America. They were heads above when I started using their handhelds years ago (no, the panel-mounts weren't any hell in those days), and now seem to be at the top on both. You can download both Jepp aviation data, and TAWS terrain data for most parts of the world, over the internet. If you buy the accessory datacard you can load all kinds of other map information (1:50,000 terrain, streets of any city or town, etc) from the Garmin Mapsource CD's.
Malabo