Easy, its clear as black and white. If you want a Helmet or suit with 'original' pedegree, go for a TE/TE2, or a Gino. These are the ONLY people so far that have invested REAL effort, and REAL money in bringing these items to us.
The custom sculpted stuff is ok aswell, because like the blokes above they acually put REAL effort in making the items. IE - TM's suits. They are perfectly fine, and happens to be the BEST custom sculpt out there. It can easily stand its ground with the above mentioned 'original cast' suits..
Even though new suits are released every so often, if you do your homework, you can tell the difference.. and know who your actually supporting.