I have to agree. If you own a 4cyl car, and want a swap, I would stick with a 4cyl. Even swapping in an "upgrade" of a v6 like a 3.2 or 3.5 is going to be costly, when the same amount of hp/tq could be had for much less using a 4cyl swap.
BTW...4K is a lot, if you REALLY wanted thing swap...