I have had a Sig P290 since june of 2011. It conceals easily, is reliable, accurate, and the trigger is smooth. Overall I am happy with it but now that the new P938 came out I have been wanting to get it. I love the 1911 style pistol and before the P290 I carried a Kimber Ultra CDP but grew tired of the weight. I will have the 938 once the rush to buy them wears off and the price calms down a bit.
Other guns to consider are the M&P Shield in 9mm or .40, Kahr cw9 or cw40, and i've heard pretty good things about the new Berreta nano?