WordPress MU

I am trying to offer only a couple of options to the admin user of the blog, so not only for the sitewide admin, but also for the admin of one blog.

how can I check if the logged in user is admin?

I tried it with these 3 methods:
get_profile('user_login') == 'admin'

is_site_admin()

$current_user->wp_capabilities['administrator']

That doesn't work. Anyone?

if ( current_user_can('edit_plugins') )

other administrator capabilities(from http://codex.wordpress.org/Roles_and_Capabilities )

switch_themes
edit_themes
activate_plugins
edit_plugins
edit_users
edit_files
manage_options
import

thanks for the help. thanks works. I need to check the blog-admin and now I am able to do this with this:
current_user_can('edit_users')

cool!