The V-10 is a great motor. I had a really hard time locating any for sale when I was in the market and ended up with a new 6.7 diesel. A friend pulls 15k with a v10 dually without problems. Strong motor, I'd buy one myself.
As KDUPL said, I'd not take a 6.0. Well, maybe for free. The 6.4 turbo diesel (2008-10) is better but as far as repair history I'd personally go v10.
Don't rule out the newer 6.2 V8 gas motors from Ford either... you might find they are within reach. Proving to be a solid power plant from what I see.