Basically they are offering you the same Apple $'s as the high end MacBook Air or MacBook Pro -- $2499.
I'm quite sure they'd let you trade over to a MacBook Air high end if you wish.
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However, remember you are in the old machine about $2050 if you include AppleCare -- so it isn't a smoking deal if you have to add AppleCare on the current machine. Something which should have been transferred over by the account rep on the new machine if you had it on the original machine.
If you have the box and simply never registered it, and you ask for a MacBook Air high end instead you should still be able to make use of the AppleCare Box.
Also think about this, if you have to buy AppleCare for the MacBook Pro high end you'll be in it at around $2500 -- which is basically free AppleCare on a machine you didn't want in the first place.
And an all round sucky deal, if they don't comp you AppleCare and not make you pay for it again.
Almost should ask for the $2050+tax back and ask for a free high end iPod to simply walk away and buy again later.