Just spring for the kit. You can get a voightlander 15mm f4.5 lens for $500 on ebay for example. Add $20 ish for the L39 adapter, and you're golden. But really, I think the kit lens will do what you want on this trip, and you're WAY under budget. Maybe get both kit lenses. Some people aren't big fans of the 16mm lens, but considering the cost, it's still a good value.