When you say your Partner you mean wife or girlfriend?
Finacée. Half-way between both. ;-)
another option is to tell her that she gets to play on one of the accounts for free =P.
She has her own account already. :-)
let her play one of the chars. I run pally+ 3x mages on one comp and the priest on another comp. if my GF is home and wanna play wow she can just jumb in and play along, if not i do the healing alone.

Only problem is she still wanna go out for a walk/movie/dinner sometimes =)
It's a good idea, but I was figuring to quad or five box, and have either the fifth or swappable slot for her in groups. Basically she sucks hard at anything other than priest (but actually makes an awesome priest,) so it could work with your suggestion - and save a bit of money too.

We have a life/lives outside of WoW, I'd recommend watching Sweeny Todd (even though I'm not into musicals much.) On the other hand, I wouldn't recommend going for dinner at our local Chinese restaurant, it's awful. :-)