They are both great bikes, and neither has a bad temper.
Weight listings I found are 543 lbs for the 650 Custom, 512 lbs for the 650 classic and and 611 for the 950
The 650 is physically smaller and may be more forgiving for a newby even though the weights are relatively close.
Personally I started on a Virago 250 (323 lbs) and after a year upgraded to a Virago 1100 (485 lbs).
My experience with the 250 was that it was wonderfully small and easy to lift should you drop it.
It hasn't much power, but when you're learning all the basics more power isn't what you need.
The 250 was more than enough to help me build confidence for the first year. BTW I'm 5'8 and 200 lbs. It got me around quite fine.
I'm not saying a 950 is a bad place to start but for me personally, gaining confidence on something smaller made more sense.
Food for thought
Also remember, this is your first bike, not your last
For kicks, check out
http://cycle-ergo.com select a few bikes, then enter your height and inseam to
see how you fit on the bike.