Any new ideas and suggestions?
Personally, I think I will go for the SkyTest because it is suitable for my situation and seems very professional. And the staff of SkyTest seems to be very positive and helpful.
And the price is very reasonable comparing with CockpitWeb and Aero pedia.
I may order 1-2softwares and books from Skytest and try latestpilotjob for 1-3 months.