If you're looking for japanese swords, nothing compares to
Tozando, http://www.tozandoshop.com/category_s/275.htm
They have everything from Iaito, to Shinken, to antiques.
You have to be prepared to pay for it though.
If you have a lot to go on, you could even order a hand-forged blade.
All blades on that site are made in Japan, and is, as far as I'm concerned, the best source appart from actually going to Japan, or order from non-English Japanese sites.
Worth noting though - even "real" blades can hurt you in the very same way the fakes do, if they aren't kept in shape, or from abuse.
Be clear about what you're buying the sword for, and if you plan on cutting(you say you don't plan to use it, but you're afraid of it breaking? Why would it break if you don't use it?), if possible avoid swords that are only secured with one hole in the tang(not a must though).
You should also read up on steel types and their usage in swordmaking so you know what kind of sword will be best for the cutting you will be attempting.
Depending on whether you aim for light cutting, dry or wet material etc, it's easier to narrow the price-range down, if that's an issue for you.
If you do this properly, you might even safely order from lower end-sites(never go lower quality than 1095 or 1060 steel).
Most importantly, be prepared to invest in a kit for upkeep of the sword - Not doing so, and forgetting about polish etc, will cause the blade to deteriorate over time, and if you use it like that, it will eventually break on you.
Happy trails!
