The 7.2 FX is not available in a stagger-frame version. Only the 7.1 and 7.0 have a stagger option. The 7.2 is the first step in the FX line at which Women's Specific Design becomes a factor. The WSD bikes are generally designed to have more comfortable geometry and contact points for female riders; however, if your wife has difficulty mounting and dismounting a standard frame, then I'd recommend the stagger frame. That would mean a step down in terms of the specs and such, but there's actually less of a difference this year between the 7.2 and 7.1 anyway. On the other hand, if WSD and a lowstep frame design are both important, then I'd recommend also taking a look at the women's Verve line the next time you're at a Trek dealer.