Every informed advisor I've ever seen has recommended buying for purpose, and (specifically) not buying sets unless you've checked that a massive proportion of the set fits your purpose. The set discount needs to be VERY high to outweight useless (for your purpose) tools.
This means (sadly) you need a LOT more research on what your wife will be doing and (ergo) what tools are needed.
I did just that and avoided the sets. I selected a few based on advice that I'd received, making sure that there were a few in there for my guitar building :wink:
