Ultegra Grey or Silver with 105 Black

Sorry for posting such a silly question but i want some new calipers and the Ultegras are good value at the moment. I have a 105 Black groupset on the bike but the calipers are Tektros in black. Should i go Ultegra Grey or Silver or just get some 105s in Black that are only slightly cheaper to buy?
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if you go for ultegra i'd go for grey as its quite a darkish matt grey so would probably look better with black 105.