Hi and welcome ,looks like you have done a bit of homework already but every day is a school day and even at my age of 50+a bit more
Right go with a dive bottle , with a pump to much foreign matter can course to many problems with your gun , i have seen it with my own eyes .
For a gun they are so many good ones ,it all depends what fits you the best but IMO you will have a job to beat HW100k Two mags plus a silencer included .
A chronograph is a must to check the power of your gun these are excellent http://www.chronoscopes.com/
Scopes once again are a personally thing ,best t