I've got my eye on a motorcycle目をつける、目が留まる

have one's eye on [thing/person] ： [　]に目をつける、目が留まる

Paul:I can't wait until I get my end of year bonus.

Kaori:Is there something you're thinking of buying?

Paul:　I've got my eye on a motorcycle.

Kaori:That sounds great

Paul:How about you? Have you got anything picked out?

Kaori:I'm saving up for a big vacation to France next year.