We have a small kitchen & I used (4) 4" CFL cans in the ceiling
They provide a lot of light & we use them all the time
They had a $15 instant rebate coupon & the cost was $18 BEFORE the coupon
I bought about 12 of them
For my sunroom (open to kitchen) - cathedral ceiling - I went with (2) 6" cans
Further off the ground & better able to spread the light
Along one wall I installed (3) 4" cans to light the area where the table will go
Between the kitchen & sunroom will be a peninsula countertop with another (3) 4" cans
In the new great room I am also going w/6" cans - cathedral ceiling
The game room will have 6" cans too
The bar area will have the 4" cans again