Chevy,
Cirque is a relatively simple Class 2 walk up from the top of New Army as is Langley depending on where you decide to start heading up. There is no right or wrong way. If you have your sights set for Langley, I would suggest Old Army. I do not find New Army being any safer than Old Army if conditions are similar. A lot of the trail on Old Army has been washed out, but it's not some dramatic climb. Just exercise caution and common sense. I find New Army adds unnecessary distance and is not as scenic, but if you're shooting for Cirque, it is the way to go.
I do not have a gpx file for Lone Pine Peak. I typically don't carry a GPS unless it's winter or to record a track that someone has requested. I would not have been able to help you anyhow as we only stayed on trail for a short distance before heading over to the North Ridge. Once on the summit, we made the mistake of descending the cliffs instead of taking the scree slope down. My hypothetical gpx track would have shown us ascending the North Ridge, going straight down the cliffs, then wandering around cross country in the dark. :-)
If you download the higher resolution version of the first image, you'll faintly see the zig-zags of the trail immediately to the right of the yellow willows and to the left of the pines in that gulley that looks like it had a slide. This link might help you but it's pretty intuitive. If a bozo like me can find his way back cross country in the dark, you shouldn't have any problems with the trail and the short slog off-trail during the day.
http://www.backpacker.com/destinations/hikes/1221195
