How many miles are you looking at per year? That's a pretty loaded car, you're looking at an MSRP at or over $50k. With $3k down and 10k miles per year, you might be able to keep it under $600/mo pretax with the current lease deals. It'll be close though.
'15 i3 REX // Capparis // ZGW // ZTD // HK // 20"
20% Tint, Coding, LED High Beams/Signals, Painted Reflectors, MAX2 Hardwire
Past: F30 335i, E90 328xi