a couple things i've learned from car audio...
1) there are a lot of crappy brands out there. VR3 is one of them..i did a quick search on google and the only place to buy them is walmart. (walmart is not known for its high end stuff)
B) unless you need the customer support, don't buy from crutchfield. why? well..you can find it cheaper anywhere else. just go to a price comparison site and see for yourself. i do, however still go to their site to research things.
III) If the price looks too good to be true, it probably is. some brands i personally would stay away from are.... pyle, pyramid, boss, vr3, soundstorm, legacy, sony...and theres a ton more.
to do a quick glance for amplifiers on how good they actually are... find the specs on the amp and get the fuse rating, and how many watts it says they put out at a certain voltage. for example, if the fuse is rated for 80 amps, and it claims to put out 1000 watts at 13.4 volts. work backwards and take 1000 / 13.4 = 74.6 amps. that makes it within the 80 amp fuse, correct? wrong. that would only work if the amp was 93% (74.6 / 80) efficient. which its not.
all in all be careful with what you buy. if you only want to spend $150 on a 5 channel amp, don't expect it to work for very long. and im pretty sure you'll be paying more for a shop to work with a stock amp and sound system to get your computer running then you would if you just bought 2 new amps.