By all means, welcome to the forum!!!
To answer your question. yes several 6x9's do come with tweeters, these are refered to as coaxial (two way) speakers. There are also some that do not have the tweeters, these are typically midbass or dual cone models.
Concerning your amp, you have an excellent set of subs for your set up. There are several amps out there that can compliment them very well.
First we need a base idea though..
What are you looking to spend on the amplifier itself?
Once we have this information, we can point you in the right direction.
Take it easy,
-zane