Since it already has the mounting rings, I'd just go with a Roman-type baldric for now. There are a couple different options out there:
Here is one from KoA that they call a "Late Period Roman Baldric" that looks better than a plain leather strap:
http://www.kultofathena.com/product.asp?item=...rd+Baldric
And here is one that is, well, a plain leather strap:
http://www.kultofathena.com/product.asp?item=...in+Baldric
And lastly, here is how the rings were mounted in a baldric on one of my old gladii:
The four-ring mount is definately a Roman thing. I would probably just go with some simple 1" leather strapping and a buckle at the chest, then like in the example above, split the ends on one end to give 2-pts rear, 1-pt forward, and tie on my own baldric. The cost would be very inexpensive, the leather, dye, and a nice 1" buckle can be found on eBay for very, very cheap - it it would look better than the KoA offerings, especially if you were able to emboss some Saxon runes or something.
You might want to have the scabbard re-covered at somewhere like Custom Sword Shoppe and have a more historically-accurate suspension crafted for it down the road if you like the sword.