I don't own the Sigma camera but I do own two Sigma lenses. I did a quick internet search and found most people really like it and feel it gives you the most "bang-for-the-buck." The one item that people didn't like was you're stuck with Sigma lenses. Now, there is nothing wrong with Sigma lenses (like I said I have two) except you may find your calling and with just the Sigma line available a bit limited.
Here is one site:
BTW, just curious but have you tried Craigslist? Many, many bargains for film cameras since digital is becoming the standard.