I agree with "most" of the above posts.....IMO financing for fun is OK provided you do not over extend yourself and the DP is worth every penny, but that was not your question. Our first rig (97 F53 chassis with a 460 V8) was terribly loud, especially up a hill and as pointed out above extremely hot. Based on my observations newer gassers are significantly quieter, but still not anywhere near as quiet as a DP. Also different manufacturers use various levels of insulation which has a significant impact on cockpit noise.
When I first started driving a DP I was a little uncomfortable not getting any audio feedback from the engine. Driving sport cars and pickup trucks I've become familiar with hearing the engine and based on those sounds I know if something is wrong. Driving the DP I can barely hear the engine with the window open and not at all with it closed. The loss of that sense felt strange to me initially, but something I was able to get over quickly. :)
I recommend you drive both before you decide. Good luck.
Lou
05 Travel Supreme Envoy