I also got the Lancôme teint Idole in 460 suede W some weeks ago and even tested it at sephora before purchasing. I used it for an event and looked really ashy in the pics. I have since stopped using it.
oops! sorry for delay. been away for a while

so, I use Medium deep as a finishing powder. the undertone is good but it is a bit light for NC50. I can wear it in winter as a foundation because it blends with my tone and it oxidizes. I like this powder but being oily it's not a go to anymore. MUFE loose mat powder was a go to finishing powder for a few years. I think its shade 4- but it is really good. maybe a couple of months ago I was introduced to Josie maran's loose powder and it is really amazing. So far i think you can only get it on QVC in a 3 jar set. A friend at my work gave me the darker shade and suggested that it would be great color wise and with my oily skin. It has a definite cocoa tint but it does not add color really. A light dusting smooths my face, it smells amazing and I LOVE it. i wear it alone when I don't want to wear foundation and I wear it as a finish powder.
As far as lancome, i've heard it turns orange on some. For me it is great. Although I can wear it year round for a great match, I can see how it might appear ashy. I didn't notice that it oxidizes on me but I'm sure my oily skin "helps" that process. try the 470. I have used that as well and i like it!
Also, a beauty blender is amazing to apply liquids. Strangely it really allowed liquid foundation to apply beautifully and it looks better than when applied with a brush. I think certain brushes with certain foundations can apply too much product and with the beauty blender I could really see if the foundation fit me or not.
Let me know how you like Bobbi Brown. I love this....a definite go to powder for me.