The SAR-series was regarded by many as "junk" when introduced, but now have a cult following because they left the Romanian factory able to take double-stack magazines. Technically they weren't really importable at the time, but the ATF looked the other way for years while Century imported them as "parts kits" because they came into the country without fire control groups. Interesting story.
The -1 and -2 are good rifles and functionally identical. SAR 2 magazines and ammo will not be on every gun store shelf, but can easily be obtained online. Really it just boils down to personal preference.
On the other hand, $675 is crazy money for an SAR-1, more than twice what I paid earlier in the year. That deal was the result of a lot of patient looking but, even in this market, the SAR-1 is a $500 rifle, tops, based on what I see people actually paying. Of course, the folks that bought theirs for $250 ten years will scoff at the figure, but it ain't 2002 any more.