Ah yes, the marriage delemma. I've been married for close to 14 years and I have to say a happy marriage is all about compromise. If you have to choose then I would pick which ever snake appeals to you the most (assuming they're all healthy). Later your wife may see how wonderful Corns are too and then you can acquire another one- perhaps she'll even pick it out.
I don't think my wife would have liked me coming home with more than one snake in the beginning but after only a couple of months she was agreeable for a second. I would try one with your wife and see how it goes, if it works out get more. There's certainly no shortage of Corns so you can always pickup another later.
Cheers,
Jason