New stuff these days is A LOT more crap then it used to be.

New amps I would consider are Sundown (Personal Favorite), Kicker, RF, Eclipse, Audison, Zapco, Alpine (PDX series) and maybe a few others

Old school amplifiers are still very good, better then the new crap. Companies like PPI, Xtant, Alpine, RF, US Amps and many others are good.

Personally I love Sundown amplifiers. The owner is a great guy and they make there amplifiers to get down low (as low as .25 ohms on some) and accept up to 16V.

One really popular set of amps right now is the RF 25toLife series amplifiers. They are putting out up to 3x as much as they are rated for.