umm... that would be their 4x80w amp, yes? What exactly are you wanting to accomplish? push all your door speakers, or push your fronts and a sub off of one amp? THat's ALOT of juice, and it'll blow up your stock speakers in a hurry if you aren't EXTREMELY careful with the gains. I'm running essentially a power-identical amp, and I can say that I, personally would have gotten somethign else if I'd have known how I would end up running my system. Unless you're wanting to conserve space, and put your amp int he back, and use it to power a sub as well, I'd look to running 2 seperate amps. something with a bit more power say 130ish watts per ch (but 2-way) for your front speakers, then getting a seperate, slightly more powerful sub-amp when the time comes for that. (match it to your sub, but I'd say anywhere form 400w on up would be good) My reasoning for this is that ALOT of higher end components all want to be fed lots of power. they don't sound good until they've atleast got 100w flowing to 'em.
ON to the HU, kenwood is alright, but there's better to be had. (some members of thsi board are pretty anti-kenwood, often tiems with reason even) Personally, I'm a HUGE fan of Eclipse. SUPER good SQ, and pretty low on gimmicks. It all depends on what exactly you're looking for. If you want somethign that'll do sirius, Eclipse isn't quite there yet, though the rep claims they'll have a reverse-compatible module out soon (wouldn't hold my breath) but Clarions are pretty nice as well.
as for a system plan, I'd go like this: start speaker shopping right away. it'll take awhile to decide which ones are right. so spend as much time auditioning as possible. make one good solid disc of some of your favorite songs of the broadest variety of styles you usually listen to and have at it. Personally, I like Boston Acoustics, Focal, JL. YOU should also check CDT, arc, MBQuart, diamond, etcetc... After this, then find an amp that'll push the speakers you like with enough authority. Fom there, then you've got a couplefew options for subs, and there's tons of that littered about this board.... kind of depends on your timeline, but check eD's clearance specials going on right now. they're some AWESOME speakers, and they're at good prices while they're still around. Note that they're not discontinuing because they wanted to improve, they're discontinuing because they HAD to seeing as they couldn't get the flat cones anymore.
OH as for flashy dolphins... My GF has the pioneer 6500 and she loves it. Easy user interface, 3 preouts, sub control, 5 band equalizer(?). overpriced I think, but she got a good deal on it. Does everything she needs it to do, and it makes my old system in her car sound better than it did in my car. I think its due to the deck. My POS sony had ZERO control over anything.
