The amp I was saying is this one:
Rockford Fosgate. Very tiny amplifier in case you're concerned with space. SRP is 10.9k though..
As for your choices, madami ka naman choices. Remember that lower power ratings doesn't necessarily mean inferior. It simply depends on your type of "wants". If you're the person who loves to play it loud -- ESQL, SPL, LnC (ex. get out of the vehicle and listen) then look for an amplifier with good power ratings. However, if you're the type who is into SQ (sound quality), 85W is more than enough.
For what it's worth, I'm only running my system on 85W amplifiers
As for suggestions:
DC Audio 120.4. Shares many internals with those of Sundown amplifiers. People who're going to venture into LnC and SPL would surely like the 120W power rating.
Powerbass ASA600.4. Pretty standard amplifier recommendation at this price point. Dual power supplies if you open it up -- testament to what it can do.
JBL 1004. If you're into well-known brand names, JBL's 4 channel amplifier would set you 10k.
But again, go ask your installer first for what he recommends.