You might also look into <a href="http://openbsd.org">openbsd</a> & <a href="http://netbsd.org">netbsd</a>. Both are 4.4BSD based and share lineage with FreeBSD. Each have their advantages. All are wildly stable assuming good hardware.
We ran our ISP on early BSDi and FreeBSD (from late '94). Wind River & linux flavors came later. Migrated through fbsd4 while I was involved. Of course, gui's, desktop apps, and unproven drivers will always take a box down but our uptimes went as long as we didn't need to tweak/build kernels or upgrade hardware. (longest was 500-odd days for an old nameserver - go Vixie - it became obsolete & was unplugged before it crashed.)
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