Well there is not much point buying one that has no vibe function.
Going by experience with partners over the years, the majority got most pleasure from a standard size textured vibe with a decent motor in it (one that looks like a real c**k).
Combined with a 'real feel' jelly dong, your wife could have lots of fun with a blindfold and an active imagination.
Strangely enough, the least popular with 3 of my last partners was the genuine Rabbit vibe.
So make sure you talk to her about it before shelling out nearly 100 quid (It's not like I could get a refund