what a difficult decision!
If you have the MT in black, maybe the Day in black would be too similar ....why do you not use your Violet Day? If you are not happy with brighter bags then I think you should stick to the neutrals as it is a lot of money to have sitting in a wardrobe and purely admired. The Poker Fonce is quite dark isn't it? (I haven't seen it IRL tho)...
I think MT in Poker Fonce!
Tho I have just bought another day (boring (classic!) black RH) and I had forgotten just how easy and comfortable the Day is to wear...so maybe another Day in Poker?
I didn't wear my coquelicot for ages as I thought it was too bright for me...now I really love it..so maybe you should be brave?
Basically I am NO help whatsoever!

Far too many choices!