dude STFU, he's asking a legit question who doesnt know any better. say it nicely, dont be so hostile.
hey man, I am sorry about these guys. . . the thing with this forum is that. . . ppl here know so MUCH about car audio that when we are asked these kinds of questions we've heard them 10000x times. Most ppl will be assholes like you've seen, other ppl will tell you to jsut use the search bar.
Eclipse is $$$$ and the price tag is hefty for the rated watts most of the time, but it is a very good and respectable name.
Diamond is a great brand and price tag doesnt hurt soo bad, lots of people look this way for affordable SQ.
Kicker is more known to be for SPL guys that want that big bad BOOM. Amps are very solid and do thier rated power.
You can say you can go wrong with either of these 3, all do rated power and are respect. Sorry about the other guys. Most ppl on this forum have been in the car audio scene so much that they hate these questions. . . . I was lucky enough to know a tihng or two before I came. I started @ sounddomain, then went to caraudioforum.com then lastly here. Once you know your stuff this place is the best for entertainment . .but for help, you'll have trouble finding it.