Not many options available as you need short-pull brake levers.
Shimano offers some flat brake levers for its low end road groupsets like Sora and Claris. The R550 that @Lolo recommends are best option without breaking the bank.
If looking for something fancier (and much more expensive), then it's Paul Comps Love levers .
On any case I will advise installation with good compression-less housing if you don't want to end up wit a terrible spongy feeling on the levers and little braking power.