I can get these amps here is the installed price from a local shop

Alpine KTP-445U Power Pack Compact 4-channel car amplifier — 45 watts RMS X 4 at Crutchfield
I can get this on installed for 617$



Kicker 47KEY200.4 Compact 4-channel car amplifier with automatic tuning DSP — 50 watts RMS x 4 at Crutchfield
I can ge3t this one installed for 640$ It list it is 4 ohm only but I called tech support and they said it is fine at 3 or 4 ohm.



AudioControl ACM-4.300 ACM Series compact 4-channel car amplifier — 50 watts RMS x 4 at Crutchfield
This one installed price is 680$

The installed price includes all needed hardware and disable noise reduction. The kicker has built is DSP. The other 2 amps no DSP.
What would you guys choose?