which one would you buy and why?

[headbussaboi 10+ year member]

Concept 1004:

http://www.caraudio.com/forum/showthread.php?t=284245

Earthquake t2000w/4:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=350015742942&ssPageName=STRK:MEWA:IT&ih=022

Autotek MM100.4:

http://www.ikesound.com/product-product_id/6153

Planet Audio vx4004:

http://www.teamnutztechnology.com/store/product_info.php?cPath=27_53&products_id=2392

Not getting them from the listed places but just wanted to know what your thoughts are. Trying to piece together something new because I sold my amps. I did have RF 800.2 and Power 750x if that matters.

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