The Shimano FC-M580 crankset is a Deore LX crankset with 44/32/22 chainrings, and it's a good value lightweight crankset. It uses a 104/64mm bolt pattern. If you want to spend more money to shave a little more weight, you can always move up to the XT or XTR counterparts, but I personally don't think they're a good value--too much extra money for only slight weight savings. You can replace the 44T with a Salsa Ring Dinger 104mm chain guard, which is rather lightweight guard. This will yield you an effective 32/22 double up front.

In the rear, I'd go with an 8 speed, or 9 speed drivetrain. Both have available options for a cassette with a 34T cog, although there are more options available for 9 speed. I'd also consider using a low-normal (rapid rise) rear derailleur so you can quickly and easily jump to low gears when you hit those sudden hills. And with the 44T removed from the crankset, you could use a medium cage rear derailleur instead of a long cage so you can get snappier shifting. The Shimano RD-M580-GS would be an excellent choice for a rear derailleur that fits said specs.