I'm hoping the Becca undereye corrector hasn't been discontinued as I've found it the best thing ever (with tarte shape tape on top) to cover my dark, dark circles. I bought mine on qvc ages ago and kind of forgot about it, as I'd been using boots 17 phwoar paint (which got discontinued!). The Becca is fab, doesn't crease or budge, and my under eyes look good all day even in the heat.
Another recent discovery of DD's is Revolution brow pomade in blonde, kind of my brows but better, stays all day, looks natural (I just fill in where my brows are a bit sparse) and is a properly cool shade. Good find DD 
So that's my first three top products. Two more would be a cool toned pink blusher or Bourgeois blusher in rose jaspe in the summer, and either a Burts Bees lip balm or raspberry pink lipstick if I'm going out. I don't have a favourite one, although Clinique Sparkle Pop is one I've repurchased.
I do set under my eyes, which is a cheeky sixth product. Currently using No7 translucent or Bourgois loose powder (smells of roses) but when I can justify the cost I'd like to try the Laura Mercier one.
I don't like a lot of make up, it doesn't suit me but I like to sort out the darkness under my eyes and add a bit of cheek and lip colour to feel 'done'. Mascara when it's not hayfever season.