You will be able to see NGC 55 with your 200mm but you need to drive out of town when there is no moon.
Here is a list of 95 objects to look at:
http://www.iceinspace.com.au/forum/s...ad.php?t=18551 (See #42)
The magnitude limit for 50mm binoculars is 10.8 and for a 200mm scope it is 13.8 but that is for stars not galaxies.
For galaxies try magnitude 9 and 12.