First of all decide your budget...... And let us know how much you can spend.....
1) I would suggest to go for a pair of good components in the front instead of 2 pairs of rear speakers..... Get Fusion NV, excellent for SQL/SPL setups.....
2) I have no idea about these subs..... But i have heard Alpine Type R 15" bangs real hard , other options are Pioneer 3001SPL or even louder Kicker L7.....
3) Forget about chinese/korean amps and go for soundstream 720, it can blow any chinese multichannel amp all day long in terms of power and sound quality..... Also forget about this Silence amplifier (shopkeepers want to get rid of this one, that is why it is the best
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4) Sound Magus VS1500.1 is good provided you have heavy electrical backup..... Keep one thing in mind, it gives dirty power unlike any branded amp...... IMO, go for some used branded amp that gives around 1000 rms - 1200 rms ...... Pioneer GM-7500 is not at all enough for your requirements as it only gives around 400 rms at 2 ohms.....
Use good 4 guage power wires for this system and good RCAs.... Also do big3 for best performance....