Here is the scoop...or the poop, if you prefer
I'm a bit iffie on Marantz at this time. They are going through some changes at this time and are kind of in a mess. I was that way with h/k, but they seem to have conquered most of the bad stuff and appear to have gotten back on track.
That said, I would avoid the digital amps at this time. Still some things to work out at lower price points. Now Linn has a pretty good one for $15K that's 500x2, Yamaha has a 500x2 for about $4500, and Bel Canto for about $2500 which is about 2x150. These are amps alone, and all three sound wonderful. Forget budget digital for a few years, it isn't there yet.
That leaves the 430, which seems like a nice piece. Add Yamaha and Denon into your choices, and go for it. Most of the dealers in my area dumped Onkyo like a hot potato a couple of years back. Now only Circuit has it, although there is one Integra dealer, but they focus on Denon.
Don't get caught up in the numbers, and be realistic about the speakers you will have over the next few years and what you will be hooking up to it.
Remember, this is all about fun.