Hi bros, noob here from cebu, need advice on my planned setup.

Car is a toyota revo diesel, so kinda noisy.

Current setup:
hu - Pioneer deh-x4750BT (1 din)
seps - Pioneer TS-A1305C speakers

Planned setup 1:
amp: rockford punch p600x4 - 20k
sub: dls rw12 (2 ohms) will this match with the amp? - 7k with box

Planned setup 2:
amp: DLS CA51 5 channel amp - ?
sub: dls rw12 (2 ohms) - 7k with box

Notes/Questions/Advice needed:
1. Budget is 40k max.
2. Should I ditch my seps?
3. Which is the better amp? Or any other recommended amp.
4. I don't plan on upgrading it anymore.
5. I'm more of an SQ person, I like the sound of the sennheiser HD650 headphones.
6. Purely indoor listening only, I listen to rock mostly (Tool, Dream Theater, Lamb of God, RATM) but also appreciate some Sade, Sting, etc.
7. 10 in or 12 in sub? Or any other sub recommendation?
8. Discussed with an installer, 5k for deadening, 5k for wires & labor.
9. Am I better off with a cheaper amp? <15k? Car is just a revo.
10. Haven't heard of these in auditions, so I would most probably basing my decision on your input :D.

Thanks much! :D