Our budget is about 500.00 month so I know we will have to get a used pusher but we have found we can afford a new gas coach for that monthly payment.
I'd get the used pusher. A new rig, you'll be upside down for a long time, with no way out. No way out is how people end up bankrupt. If you really intend to put on a lot of miles, the dp will be worth it, you'll grow to hate the gasser.
But first, go rent a gasser and a DP, see for yourself. Think you can't afford to rent?? Well then, you can't afford to buy. Some owners rent their rigs, contact them for a weekend trip to the lake, and take the long way to experience the ride feel and noise. Been gas, got a used dp, never going back.
BTW, every DP you see on the road is used, unless it's got a transporter tag on the back. They are used right after they clear the curb at the dealer's lot, and they just lost 20% in resale.