I don't think leasing would be a good answer, even though I understand your point about rent. The two (really) big downsides are that at end of lease you don't own anything, and you aren't able to do many of the modifications one might wish to. Often when you read the fine print on an "option to purchase" agreement, you'll find that in a 3yr lease you've done very little to make headway on the principle. If you choose to purchase, the remaining amount will still be high enough that you'd likely need to finance over 60mo in order to keep a $500ish payment. That's an 8yr payment plan which isn't good sense.
Generally, I believe that if your credit qualifies you for a lease on a $45k vehicle, you should be able to get financed to own on a used $30k...and that's going to put you in the $500/mo ballpark. Ford Transits are really having an effect on this market point, and for $25k to $30k there are many options in used sprinters and transits. Google 2015 Transits and you'll see you could get something for 500/mo and have a 1yr old vehicle with between 5-15k miles.
The reason you don't see that with Sprinters is because they ALL have the diesels which adds $5k+ initially, and seems to keep the first year prices high.