Decisions=Confusion

I need a new amp and cant decide on a hifonics amp or mabe something else i was looking at a ppi. I have two infinty refrance 12s 300rms@ 4ohms svc

For hifonics the warrior merlin would work:154 bucks

RMS Power: 200W x 1 @ 4 Ohms

Bridged RMS Power: 300W x 1 @ 2 ohms

or the zues zx4400 2x220 @4 ohms a 4 ch amp

or the nx440 nemisis a 4 ch amp 

both of these can be had for around 180-250

or the ppi PPI PCX-480\RB 4ch 640watts 200 bucks

After looking at these amps i am a little lost ??? what is the better amp?

Also i need new speakers for the front speakers. i would drive them off of my head unit. what i had in mind was the infinity componets 120 bucks

frequency response 67-21,000 Hz

power range 2-75 watts RMS

Or the pg componets   69bucks

I have jensen amp(2ch) sitting i can use it is just it is a jensen should be fine though to run a componet set at 4ohm though but i cant decide on a amp i have read though the forums and ppl say ppi and hifonics are both good amps