I hope you're ready for the large expenses that a catamaran in the 40-50 foot range are going to incur. Large cats have very high docking/moorage fees, mainly due to the wide beam of the boat.
Weight is always a problem on catamarans. There is a lot of storage space, and if you fill them all up, the performance of the boat will really suffer.
I would highly recommend that you read Chris White's The Cruising Multihull as a primer. Although the book is a bit dated, it is still an excellent overview of multihull cruing boats.
I would also recommend chartering on several cats that interest you before purchasing one, as that will give you some real world experience with it.
Generally, the sailing performance on the cats is slightly better on the ones that have a centerboard or daggerboard, rather than just keels.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.