SOLDIERX.COM Nobody Can Stop Information Insemination

well after much work i have begun beta testing my new MRI like clone application written in c# .Net Framework 2.0 (so it would be compatible on just about all systems0 but im curious whats a good .exe packer? i would like to compress the file size and if possible add a bit of security to it, i thought of adding a MD5 Hash comparison on the home screen of the app as well, any thoughts on that idea? where it would show like this in a label:

Supposed to be: (MD5 Hash that it is supposed to be)
IS: (MD5 Hash check of the actual exe)