Personal opinion.....buy a custom ordered coach. Here is a short version of why.
It doesn't cost the dealer anything and is free money for them. They never had to pay anything to get that coach to their lot. You did all of the paying. When you do that, they are a bit more motivated to make a deal as it is free money for them.
The longer version.......Most coaches (cars, rvs and anything else on a lot) are there in 1 of 3 ways. The dealer bought them and owns them completely. The dealer paid some money and partially financed the rest. And the most common way, the dealer has a loan out and is paying interest only to have it there. They are always motivated to sell......however, when you custom order a coach, they never have to put down a dime because you are putting down the money. So they get what I call pass thru money. They will accept the coach on delivery, clean it up and do the paperwork and they get paid for this. At no time do they have to invest money for that coach. It is essentially free money for the dealership. As they have nothing invested, they seem more willing to make a deal that is great for the buyer. They usually don't even have to store it on the lot for more than a few days as you are most likely picking it up fairly quick. In addition to all of that, you will end up with exactly what you want because it is a custom order.
We did this for our coach and got about 33.5% off of the MSRP. As well as I could figure out at the time, the average 'good deal' was between 27% and 29% at that time. So We got about an extra 5% off. Also, do not be afraid of shopping around. You are spending a lot of money for this and are not tied to any particular dealer. It does not hurt if they know you are shopping around either.