I've seen a
lot of Greek sites in my life and honestly 90% (if not more) are horrible on many levels... most don't even update their site more than once a year and thus are completely useless. As many other people have said, keep your site up to date; use a dynamic script when possible (see
www.hotscripts.com for some free scripts) and remember, content is key.
Here are a few FIJI chapter sites I like for various reasons:
http://www.ixfiji.com
http://www.student.richmond.edu/~fiji/
http://www.fsufiji.com