Alderney or Cherbourg would be OK as long as you planned well and take a number of things into consideration - weather window (p'raps consider sending a big boat out first for a look?) and fuel requirements. Alderney is good for camping (do you plan to carry tents, etc?
), and has duty free, Cherbourg better for, err, well just being French! I would suggest not
combining the two as the water between Alderney and Cherbourg is quite treacherous.
When planning for the weather window, look at a site like www.ecmwf.int
where they use a Cray Supercomputer to model the predicted pressure and wind patterns - they are remarkably accurate.
Remember that you're quite a commitment once you're offshore - we did some radio and mobile tests a few weeks ago, and found that mobile or VHF coverage both only stretch about 10 miles out. Because the Coastguard mount their antennas on hilltops and broadcast at high power, you can hear them when they can't hear you (mind you, I think we only tested at "low" power).