If your plan includes serious passage making as well as trans-oceanic journeys, inevitably this list of boats comes up for discussion:
Mahina Expedition - Offshore Cruising Instruction
Most would say it isn't a complete assessment of boats suitable for bluewater cruising, but it is a great resource and more complete than many tid-bits you'll find on the Intraweb. It hasn't been updated since Jan 2008, however...so its due for a refresh.