I think harleyxlc is on the right track with questions...is she ready for a litre bike?
The 955i is, in my opinion, a mild litre bike, but it's a litre none the less which makes it plenty fast. It's also a touch heavy too. The best thing to do...if she decides she's ready...is go take one for a ride. It truly is an awesome bike.
As for maintenance, parts are relatively easy to find, if you know where to look. Everything on the bike is metric and there are some special tools that make things easier, but the special tools can be worked around. There's a few websites that are packed full of triumph experts and SBN has a couple of local guru's that are always very willing to help (<cough>kevinwilly<cough>)...I can speak from experience there. Once you get into the bike, it's not too tough to work on.
I have to warn you though...once your wife gets a Triumph, she will be addicted
