for me it varies wildly, depending on what i am doing....I tend to using hi quality stuff as these are for my use.
my latest build, used heavily from parts I had in the inventory (pile of parts mess)
so I paid 170 for an SR Semi pro
panaracer pasela tires 60
conti race lite tube: 19
jagwire brake and shifter cables 30
rear rack 30
so direct cost of $310
but parts i had and reused would have been several hundred dollars cost if I had to aquire
Brooks B17
Velo orange postino bars
cork/rubber grips
tektro city levers
Tektro dual pivot brakes
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Life is too short not to ride the best bike you have, as much as you can
(looking for Torpado Super light frame/fork or for Raleigh International frame fork 58cm)