well you have to work under the bonnet so basically you want a colour that either shows you if the car has leaks or problems or a colour you wont get sick of over time
i alot of people that paint there car usually paint the entire car the colour and looks quite good
if you don't really think you will open it that often then any colour
MY OPINION
choose a colour for the whole car that you really want then do the bay that colour
i have a ke55 coupe it white with a black bay but i must admit at time its hard to see things when working in there without a light and i did say at times look at other 55 or 35 thread on here lol
hope my 2 cents has helped ya