Hi Jon,
I am also gonna throw in my two cents and say that the 6 or 8 inch dob would be the go. Value for money (read view for money) a dob cant be beat as a great all round scope and as already stated, combine that with a cheap stellarium or planisphere and a lot of fun can be had poking around the night skies making new discoveries.
Of equal note, if your other half decides that astronomy is something that she wants to pursue, then a GoTo mount (i.e EQ5 or EQ6, they will be under mounts section on the bintel site) can later be purchased on which you could mount the scope that you
already have. That way you could save the extra expense for now until you are sure that she wants to make a solid hobby of it, which I am sure she will.
This was pretty much how I personally started out... well actually someone bought me a dick smith type refractor. It was completely useless except for the moon, however that set off the bug and then I moved to a 10" dob two weeks later. Havent looked back since
.
Again, I would suggest going to a club night, unless it is for a surprise gift etc, in which a club night aint so romantic.
Any way, good luck mate
Sam