What's a good price?

Hi all. I've been lurking around these pages for some time, but am now seriously considering purchasing a new TM here on the West Coast. In fact, I'm finally making a visit to a dealer tomorrow, having seen their demo's at an rv show.

I would really appreciate hearing from you all what might be considered a "decent deal" on a new 2015 TM, specifically these models:
2417 standard and sport
2720 (leaning toward this one)
2922 (they have this on the lot)

I expect I would get most of the options available. Do I stand a better chance of negotiating for something that's already on the dealer's lot vs ordering exactly what I want? I bought a popup back in the day and basically paid what the dealer asked. Later, I felt I should have tried harder to negotiate but, unlike buying a car, it felt like a done deal to me. I'd like to come away from this experience feeling like a didn't overpay.

Any and all help/information along these lines is welcome!