Im planning similar excercise 6/12 months off and cruising to Azores via France Spain and Portugal. Leave mid/end April I hope. If you have budget planned I would be interested as my own goes as follows:(This is for the two of us per month)
One week per month in Marina............... 84
Anchoring/Mooring ave 3.50 day..............81
Food and drink.......................................200
Laundry..................................................20
Camping Gaz and petrol...........................30
Diesel.....................................................20
Maintenance and Sundries.........................65

There was an article about costs in mag last month for 25 week cruise costing under 3000pstg but seems very low. Also I intend taking mobile phone and connecting to laptop on board fr e-mail. Have you explored this and if so what software is needed to connect mobile? Another Q is Tillerpilots - I have had to date 4 Autohelms and they all get soaked and stop. Are you using wind vane steering or electric? And dilemna over power generating - wanted aquair but so expensive! Any suggestions there apart from running diesel every day to charge?

Sorry fr all the questions but do not get much contact as working in Saudi at present and doing all by e-mail.

Richard