You can get a motor for an ip-and-over door, like what you have. Can be fit perfectly fine.
I splashed out a little and went for a full system - a sectional garage door, lie this:
http://www.thegaragedoorcompany.ltd.uk/sectional-garage-doorsThe beauty of these is that they open vertically and into the garage, since the sections are hinged. This means you can get a larger car into the garage, or park a car right up to the door in front of the garage, and still open the door fine, since it doesn't open outwards etc.
Cant remember the make of my motor without going out and taking a look, but it was one of the top models that came with a 10 year guarantee and is maintenance free. It comes with 2 remote fobs which I can press from quite a way back, so the door is fully open before I even get to the drive.
Most also come with a courtesy light etc, which stays n for about 2 mins then goes out itself.
The teeth of the motor lock when the door is closed, so its pretty much impossible to open the door once down - even if you stick a jack under it etc. In fact the manual states that the motor/door shouldn't be installed on a garage with no other access (I have a rear door on the garage as well, and a side door into the house) since once its closed you cannot break in at all, unless you cut through the steel door.
The installer told me he once had to go to a house where they couldn't open the garage door and had lost their fobs, so the owners had to break into it via the roof of the garage!
If you need further details on the motor I have give me a shout