Prop SIC hourly rate is $7.69 at the moment with AirNet. I do believe the monthly guarantee is 160, or a 40 hr week. The training contract is effective for one year after you have had your 135 PIC check-ride! There are some changes in the works for a training contract. Not entirely sure how the final product will look.
As far as 500 hrs, they would ideally like you to have the 135 minimums, we all know there is a lot of hiring going on right now so if you are persistent enough and fit their profile (good basic instrument skills, theory and flying and judgement/attitude) I'm being told that as low as 200 TT and 100-150 ME time is possible!
If you look at this http://www.airnet.com/Careers/careersFrame.htm you will find some good information. Just remember to bring a little salt as far as pay goes. At AirNet your guarantee is an hourly rate for 40 hours a week. Don't plan on making more than that. Having said that it possible to make more and a lot of the guys do. Obviously the senior guys have a tendency to pick what makes the most.
GL,