got boned on my last deal, help with new pricing!

[Joepro]

long story short, drove 3 hours to see a Z that I have been working via phone/email, the salesman calls me when I am 5 miles from the dealer to tell me another salesman was working a deal on it ans it was sold...looked at the car anyway and has some undisclosed flaws, good riddance. looking to persure one of these three:

2009 White Nismo, 26k miles - $28,600 (wish it had lower miles..but Nismo hmm)
2009 black nismo , 32k miles- $28,995
2010 White Base/Sport, 10K miles, 6 mo factory warranty left, 28,400.

Would love to walk away only paying 27k for of these...Going into fall here, but do these seem reasonable? The one I was going to buy was a 09 touring.sport for 26k, with 21,000 miles.

Any input would be appreciated, the two white ones are practically in the same town, I am going to go try and see both of them tomorrow afternoon. Going dealer because I am financing 20k with a PNC check ready and paying cash for the difference(up to 10k if needed, but less I pay for the car faster it gets modded!) So its practically a cash deal too.