You never want to spend top dollar on a car you do not want. If you are buying used you have limited options. I would tell them to either make a dealer trade or to give you an incentive to wait. If they have nothing to offer tell them you are going to look at a similar prices small car with the options you want. They may give you a rental car while you wait for yours or give you a price reduction that makes it worth waiting for... you'll kick yourself later if you jump into a brand new car that was not what you initially wanted.
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View my fuel log 2010 Yaris 1.5 manual: 36.9 mpg (US) ... 15.7 km/L ... 6.4 L/100 km ... 44.3 mpg (Imp)