For a long long trip, full of gear, performance won't be great.

I would say that a june-onwards med trip will naturally be fantastic, but could also be fabulously expensive mooring-wise. For example, around where we are in S of France, a 42footer can pay Ł50 a night. But, there are lots of quiet anchorages, so all you need is a decent anchor, a long kedge to line up out of the bay and the very best rib/ternder that you can find for pottering around, shopping and so on that will get you ashore as dry as poss. Note that lunchtime marina stops are normally free of charge, good for niping in, topping up with diesel, shopping, off again. Without airconditioning, you won't want to be staying in the marinas anyway.

Not sure if it is still for sale, but there's a 44' boat whose kit list makes useful reading on
http://www.shantooti.co.uk/