Jay, cats like Russian Blue's are notoriously bad tempered, and not exactly lap cats.
As Nixy has already mentioned Blue Burmese, Burmese are very intelligent, inquisitive, rather inquiring, love attention, much quieter than Siamese (aka bigmouths of the cat world), quite a family orientated cat, they will follow you around, inside or outside, they're generally good hunters. Blue or Lilac Burmese are in general much more docile than say a red, cream or seal, or cinnamon Burmese or Siamese.
http://en.wikipedia.org/wiki/Burmese_%28cat%29
http://www.burmese.co.nz/Previous%20Litters.htm
Another derivative is the Tonkinese, which are quite similar in nature to the Burmese. Fabulous cats. They're not as common as Burmese either.
http://en.wikipedia.org/wiki/Tonkinese_%28cat%29
Often in the cat world, darker pointed ones can tend to be a bit scatty. Not always, but quite often.
If you get a pure breed anything, don't overfeed it, keep it lean and healthy.
My folks, breed numerous breeds of cats when I was a wee nipper.