Hi, my advice would be to start with one and take it from there whether you need something wider or more tele. The two most likely lenses for the XP2 are the 23/f2 or the 35/f2. Both are almost designed for the XP-line as they don't block the OVF. They're also weather resistant if that is important to you. The only issue is that the 23/f2 is a bit soft wide open at the shortest focus distance. For general photography its not an issue. The older 23/f1.4 is a great lens, but a bit bulky (compared to the 23/f2) and slow and noisy to autofocus. An often overlooked combo for travel photography can be the 18-55/f2.8-4 and the 14/f2.8. Both are quite good, relative compact and have the same filter size/hood. They're also relative cheap to buy pre-owned.