Sellers that want you to buy something without looking are trying to scam you.
You sent your deposit - the car is yours. If you want it.
Don't EVER buy a vehicle with out a full inspection - Even if you know the seller - even a new car.
You are right - this seller has a better offer, and is looking for a way to get out of your deal.
If you want the car it is legaly yours, but you may have to take him to court.
is he willing to give back your deposit? Maybe you should just take it and forget it.
Sounds like this is going to be a real hassle.
No one who REALLY wants to sell their car is going to be that picky about a few extra days.
Something else is going on, and he want's out of your sale.
Maybe it is a blessing.
i had the same thing happen to me 2 years ago.
This seller lied about the condition of his car.
I flew, and drove to the middle of Hickstown Indiana,
only to find a car that had been patched together, and was not driveable in it's existing condition.
The seller wanted top dollar and described it as a show car.
This was someone who i thought should have been trustworthy.

He had tried to get me to buy it based on his description alone. Lucky I went to look.
You really can't trust anyone anymore. It is still BUYER BEWARE, eBay has made this all much worse.
Nothing surprises me anymore....
Well I am surprised these days when someone is actually honest.
I would rather get a bidders strike, then buy a junker.