Ah, I was looking at the Series 2 M35's, going for as late a model as I can get (likely a 2007), so only NA options according to Wikipedia (taking that with a pinch of salt of course, let me know if it's flat out wrong).
250RX: VQ25DD engine (V6 2.5L NA, direct injection, 158.3 kW), rear-wheel drive
250RX FOUR: VQ25DD engine (V6 2.5L NA, direct injection, 158.3 kW), four-wheel drive
350RX: VQ35DE engine (V6 3.5L NA 200 kW), rear-wheel drive
350RX FOUR: VQ35DE engine (V6 3.5L NA, 200 kW), four-wheel drive
AR-X FOUR: VQ35DE engine (V6 3.5L NA, 200 kW), four-wheel drive
edit: Ugh how can I stop this forum from stripping all my line breaks out and making my posts look like they were typed by a 13 year old with ADHD?