depends on what you need. im a big fan of JL's overpriced XD500. class D (digital) amp that is small, low heat and has been bulletproof for the last 5 years. i have it in my car running a pair of components in the front and a small 8" sub. i got it from al & ed's (they're an authorized JL distributor), pricematched to whatever cheap online store had it for under $300
for example:
JL Audio XD500/3
listed for $280. pricematch with al & ed's and you'll get it for the same price with a legit warranty