My dad has an ancient edition of this book, and I find that it is literally impossible to sit down with the objective of reading it from start to finish. It is written so beautifully, though, that once I pick it up I like to flick through and read a ‘scene’ or two from it (like the death of the Law-writer for instance).
Otherwise I highly recommend The Pickwick Papers - you never get bored with it as it isn’t a novel so much as a series of set-pieces - and it’s very funny (I particularly liked Bob Sawyer the debauched medical student).
I really liked Dombey & Son as well, but that’s the last Dickens I’ve managed to finish. I’m still meaning to read Our Mutual Friend but I never get round to it. :o