A lot of that depends on the box you have made
The Sundowns and the SSA's are very similar and to somebody who was not into car audio would probably sound the same
The difference between the 2 of them is a matter of having a trained ear.
Like I said box is everything here
Slugbutter has it right, if your not going ported then the JL's are your best bet
I'm trying to remember but I'm pretty sure he is the other guy on here who are big into box designing so I'm sure he is talking into account your lack of space which maybe the rest of us are not
Ported IMO the SSA are a better choice
That being said your putting them in a Corvette which lacks space so if you can pull off ported then SSA but if you can't the JL is only way to go
Sorry I can't see anywhere if you listed what amp you are going to use to run them