What would be a good amp?

I was pretty sure I wouldn't be able to with four hundred but I can dream right, I'm willing to go past that though I figure that hifonics is about 20% off from what I've heard other people say after they get there amps bench tested so it might be pumpin out 1600 maybe even 1700 watts rms at 1 ohm. 20%(damn maxxonics) off ain't too bad a number when some low end amps are up to 80% off I figure I'm gonna have to upgrade my electrical system because with the Lanzar amp that I have now my headlights dim hard when my subs hit. Its probably just because of the low grade construction of that amp but I'd like to have a little room for any outside variables. I won't upgrade till I see how my new system performs of course, whenever I figure out what amp to get I figured I'd b safe going with Hifonics because they are the #1 budget brand amps IMHO, but if I could find an amp that says 2000 rms and put out 2000 rms or at least with just a 5-10% margin of Bull of the true power that would probably be a good way to go depending on the price. 1984 chevrolet Impala stock alternator no big three upgrade and a titanium battery that I got out of my dads pick up. sonicelectrnix.com has some of the best online prices some of there poducts even are available with a manufacturers warranty and they deliver on time if not sooner using UPS just wanted to throw that in there cuz that Hifonics amp I'm lookin at is about 350 on there before shippin of course.