try them at 1200 and see what kind of temps you get.
i have mine at 1470, 1330, 1330. But i run my 8 cores at 800% pretty much all the time. 1470 RPM on the CPU gives me a temp of 53ºC
there is a tradeoff. my mac is no longer silent, but i'd rather it be cool. If your not running 800%, treat yourself to a more silent running, maybe between 1000 and 1200?
you can try;
http://www.macupdate.com/info.php/id/16609/hardware-monitor
or
http://www.macupdate.com/info.php/id/12381/temperature-monitor
to see what going on more extensively than the number SMC gives.
before installing SMC, my RAM was in the 80ºs, and anything that starts getting close to being able to boil water makes me nervous.
you can also follow how hard you work your CPUs and RAM modules in the activity monitor (apps/utilities/activity monitor). Arrange your columns by CPU% to see whats the most demanding, and click on the 'system memory' button below, to follow your RAM usage. Watch your page outs, if its in the gigabytes, you might not have enough RAM.