Wife knows a "pro". Her opinion:
Husqvarna! All the way!! I have a "daisy"
http://new.husqvarnaviking.com/en-AU/Machines/DAISY-325 that I love with all my heart. I think it was about $500 when I got it 10 years ago, but I bought extra accessories and stuff so I spent about $650. In all that time I have had to change the lightbulb once. That's it for repairs. If I were shopping now I'd probably get an Emerald, they look to be around $400-600
http://www.goodhousekeeping.com/product-...reviews#slide-6
and 118 models I think).
He's going to have to find a local dealer tho, they don't seem to sell them online anywhere except used. There are a couple
http://www.ebay.com/itm/Husqvara-Viking-Emerald-118-Sewing-Machine-only-used-twice-/141135198506
of Emerald 118s
http://www.ebay.com/itm/Husqvarna-Viking-Emerald-118-Sewing-Machine-With-Extra-Bobbins-/331082117763
on ebay at the moment. But man, worth it. The internal workings are very high quality and changing the bobbin, and presser feet, is almost instantaneous. You can wind a bobbin while your working thread remains in the needle. This kind of stuff seems like no big deal, but if you are sewing a lot those 3 things will save you a lot of time and frustration. The machine threads really easily too. And they don't break (unlike Brothers, ugh those things are plastic [censored]-boxes).
Other than that I'd suggest a good Singer or Kenmore. I know nothing about Janome, the other of the top 5 producer in the US.
Personally I'd avoid the electronic model style as well. When something goes wrong you have no choice but to drag it to a dealer for repair. I'd also avoid the embroidery units as well, unless that's a particular goal/interest of hers.
My main advice: as with any tools, get the best quality you can afford. I have a Husqvarna sewing machine, husband has a Husqvarna chainsaw. =)