Hi Herbie,
As far as racing games go for the wii i own 3 of them. Need for speed Carbon, Need for Speed Pro street and GT Pro series.
Forget GT Pro series - really regret buying that!
Need for speed, both games are good in different ways. To build up the car and your own crew to build new ones i would deffinitly recoment need for speed carbon, the down side to this game (from your husbands point of view) is that it is set in city streets and not on race circuts.
Pro street i found to be ok, though not as good as carbon in my opinion, it is set on race tracks but lacks the sheer playability of Carbon.
If you want to spend the money on something other than a wasted memory card i recomend need for speed carbon. One drawback however, or maybe a blessing, is that your hubby wont do much else but play it got sy least a month, without meal breaks.