Since version 2.1.0 you can mark your most important payment receivers as a favorite. So you can easily search for these contacts, as the favorites are shown in the beginning of the list of suggestions for payments.

This is how you can mark a contact as favorite:

• in the payment window: just open a new payment and mark the contact in the list of suggestions with the yellow star as a favortie
• in the transaction details:open the transactions details of a transaction and then tab on the yellow star besides the receiver 
• at the end of a payment: if you did a payment sucessfully you can also add the contact to your favorites at the end of the payment

Please note: 
Only contacts where the IBAN is transferred can be marked as a favorite.