Looking,
30k Doesn't buy you a use-able catamaran - you might find a old Gemini 3000 for that, certainly not a Gemini 105 or 105mc.
30k buys you a LOT of work before you put it in the water.
Keep in mind that for the most part, you get what you pay for.
Look for Charles Kanters 'Cruising Catamaran Communique' it is an excellent choice of reading for and a very good source of data for all things cruising in catamaran's and their realitive merits.
If you have any questions, feel free to PM me, I'm the resident Gemini owner - SailDog just wishes he was
Chuck
Patience Two, Gemini 105Mc #987 - launched May 2007