I'm glad if the informations can help you. Now to answer your questions:
1) - I buyed one audison bit ten D : 549,99$
- Wire Kit 4 gage : 99,99$
- Dynamat kit : 49,99$
- 2 speakers set of JL-audio C2-650 330$ on ebay
and I had my own clarion amp. So to give you an idea it's around 1030$ without taxes and without installation.
2) It's my first time with dynamat and I like it a lot. It's like a insulator, you don't lose the sound in the doors. The bass is more present, more real and more loud, I love it!
3) The bit ten and amp are in the same place where the original amp is!