I still think the better deals are December through January. I bought mine in January and got 8k off and 0 percent. and the tax write off on top of that.
I completely understand that you want power, I have been down that road.
If I was buying a rig personally (not through business0 and not driving it everyday, I would probably buy an older big block gas, dump a couple grand in it to make it reliable, and bank my money.
Good luck, I will warn you though, once you drive an oil burner you won't look back
