While i'm certainly not a kit expert, i think just using some common sense will probably get you in the right area.
Since your wife likes the reds, and you don't care so much at this point in time, stick with that type and you will have something close as far as taste goes. (read the descriptions of the kits)
Most of the kits i have looked at finish dry, but offer suggestions for sweetening such as adding syrup prior to drinking. Sweetening prior to bottling can also be an option, but is more involved. There are also ice-wine kits that sound like they finish sweet, but i don't know anything about them, like if they are more complicated to make for us 'newbs'.
On the financial end of it, it seems a lot of newer winemakers tend toward the lower costing kits because if something goes way wrong, your'e not out a bunch of money. You can always spend more later if you want to pursue the hobby further. Besides, unless someone is kinda fussy about their glass of wine, the lower end kits seem to be fine in most cases.
My understanding is, the main difference in quality of kits is the level of condensation from the pure juice.
(more juice + less water = more money + better wine.)
Finally, if you search this forum, there are quite a few threads from people basically reviewing the kits they have done.
imho, there really isn't a 'wrong' choice. Just a matter of if you decide to do it or not.
Good Luck and welcome.