First question is whether you had to have that "zippy' v-6, or could be satisfied with a 4 cylinder engine! One is about 50% more to fix than the other! Even at that it sounds pretty "pricy" to me! But lets not go into that at this point!
First thing I would ask, is can you find anything that you can replace it for --- for this amount of money! I'm not talking about "taking on payments" that go on ad-infinitum!! Your car has a "junk value"l -- Lets say maybe the junkyard will give you $100, - so now you are talking $2600 replacenment money! ................ Can you replace it for this?
I have never had a car, - or seen a car that "blew" head-gasket because of a coolant change, - so there must be more to this! You must have blown a hose and lost coolant and overheated or something, -- now let set this aside too!
Main subject .. my guess is that you can get headgsket replaced for closer to half that amount mentioned! If this is a garage estimate, -- look for more estimates! Even rebuilding or replacing heads with rebuilt -- it shoulodn't run much more than this! Of course the determining factor here is just how far you drove it oveheated, -- Engines just aren't designed to run indefinately without water!!
As a matter of fact, I wouldn't be surprised if you could get a used engine from a wreck or somehting, - and have it "swapped" for around $1500. True this is not a new engine, - but it is not a new car!--- (I must tell you though that it is about 6 years newer than my 280K miles car!) This would get the car back on the road,- and if you did not want to keep it then, - it has some value at least! now from what I see 01' cars are bringing around $4K now (or more).. If you don't like it,-- sell it outright and then go for another car! Don't buy a new one, - buy a used one (preferavbkly one you can pay cash for)! let somebody else "loose the depreciation" for a while! Unless of course you believe that nothing but a new car is any good (and of course a $35,000 car has a really good warranty). You can buy an "aftermarket" warranty on your "lateish" model car for about $800 a year , - if you don't want to take the risk yourself!