For brushes, check out www.crownbrush.co.uk - there is a minimum purchase amount on there though I think, so you would need to be stocking up. They are nice quality.
Otherwise, you can't go wrong with the Royal foundation brush (about £3 including postage on amazon here).
I bought some end of line Smashbox brushes from Justbeautydirect.co.uk a while ago and they were half price and lovely quality.
I am switching between MAC studio fix and Estee Lauder double wear foundation at the moment - I think neither of them are quite the right colour, despite being 'colour matched' at the counters though.... 
I use MAC Select loose powder, which is okay - Dior do a nicer one, but I bought the MAC as I had gift vouchers for the MAC store and it's fine, just not as nice as the Dior loose powder.
I like a loose mineral powder blush (got several of the super cheapo Maybelline ones and they're pretty good) although I do use NARS in 'Orgasm' from time to time - it's supposed to be the most amazing blusher ever, but I just find it to be fine/ok to be honest.
Favourite mascara is Diorshow but it's stupidly expensive - just bought an Estee Lauder one as it was bonus time and I was buying foundation so thought may as well to get the free gift - Sumptuous Extreme. It's nice enough I suppose, but still prefer the brush on the Diorshow.
I like MAC lipsticks, also Estee Lauder crystal colour lipsticks are nice and not drying - sheer colours but don't last at all, you do have to reapply quite a bit.